US20220031029A1 - Improved shallow depth cut diamonds - Google Patents
Improved shallow depth cut diamonds Download PDFInfo
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- US20220031029A1 US20220031029A1 US16/080,940 US201716080940A US2022031029A1 US 20220031029 A1 US20220031029 A1 US 20220031029A1 US 201716080940 A US201716080940 A US 201716080940A US 2022031029 A1 US2022031029 A1 US 2022031029A1
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C17/00—Gems or the like
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C17/00—Gems or the like
- A44C17/001—Faceting gems
Definitions
- the invention is directed to finished cut diamonds that have both excellent optical characteristics and exceptionally high yield for the finished stones. More specifically, the present invention provides both round and fancy shallow pavilion cut diamonds with exceptional optical characteristics.
- the round, brilliant cut has been the round diamond market standard since it was developed by Marcel F. Tolkowsky in 1919.
- the round, brilliant cut and most other popular round cut diamonds include a relatively tall crown height, steep pavilion angle, and high total depth percentage.
- the girdle diameter of these stones is relatively small in comparison to their pavilion depth and the total depth of the stone.
- prior art round, brilliant cut diamonds have excellent optical characteristics, their tall crown height requires a relatively high stone weight for a cut diamond of a given girdle diameter. For some rough diamond stones, this tall crown height can result in a higher than optimal loss of weight during the cutting and polishing process when converting the rough diamonds to finished stones.
- prior art fancy cut diamonds have traditionally had relatively steep pavilion angles in order to avoid inferior optical characteristics, such as the “fish eye” effect, in the finished fancy diamond.
- the steep pavilion angles and relatively tall crown heights of the prior art fancy cut diamonds resulted in higher than optimal loss of weight (low cut weight yield) during the cutting and polishing processes.
- cut diamonds with relatively shallow pavilion angle cuts combined with the other parameters set forth below have optical characteristics that are at least equivalent to, and often superior to, the prior art standard fancy cuts and round, brilliant cut diamonds.
- the cutting and polishing weight loss is significantly reduced for many rough stones.
- the higher proportion of girdle diameter (round cut) or surface area (fancy cut) to stone weight provides the visual impression to consumers that the stone is significantly larger than its actual carat weight.
- round, cut diamonds with excellent optical characteristics may be cost efficiently cut from “flat stones,” which can further reduce the cost of the round, shallow pavilion cut stones of the invention relative to the round, brilliant cut diamonds of the prior art.
- Another object of the invention to provide a shallow pavilion cut diamond with enhanced light reflection amplification.
- the invention includes a cut diamond having a round shape.
- the round cut diamond including a table having a table plane and a substantially annular girdle.
- the round cut diamond has a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage.
- a crown surface is located between the table and the substantially annular girdle and extends in a crown angle to the table plane.
- a pointed culet defines the bottom most portion of the round cut diamond.
- a pavilion surface extends at a pavilion angle relative to the table. The crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 25 degrees and about 36 degrees.
- the invention further includes fancy cut diamonds with a table having a table plane and a girdle having a non-circular circumference.
- the fancy cut diamonds have a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage.
- a crown surface is located between the table and the girdle and extends in a crown angle to the table plane.
- a pavilion surface extends at a pavilion angle relative to the table.
- the pavilion surface includes a plurality of substantially planar main pavilion facets each of which extend from the girdle having a non-circular circumference to a pointed culet defining the bottom most portion of the cut diamond.
- the crown angle is in the range of between about 29 degrees to about 36 degrees and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees.
- the phrase “fancy cut diamond” includes all cut diamond shapes that are other than substantially round (when viewed from above), shaped diamonds.
- the present invention is further directed to cut diamonds having a table with a table plane and a girdle.
- the cut diamonds have a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage.
- a crown surface is located between the table and the girdle and extends in a crown angle to the table plane.
- a pavilion surface extends at a pavilion angle relative to the table.
- the pavilion surface includes a plurality of substantially planar main pavilion facets, each of which extend from the girdle to a pointed culet defining the bottom most portion of the cut diamond.
- the crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees.
- the cut diamonds in accordance with this aspect of the invention may be either round shaped cut diamonds or fancy shaped cut diamonds.
- FIG. 1 is a top plan view of a round, shallow pavilion diamond in accordance with a first embodiment of the invention
- FIG. 2 is a bottom plan view of a round, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 1 ;
- FIG. 3 is a side plan view of a round, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 1 ;
- FIG. 4 is a side plan view of a prior art round, brilliant cut diamond
- FIG. 5 is a side plan view of a prior art round, brilliant cut diamond illustrating its measured light reflecting and refracting properties
- FIG. 6 is a side plan view of a round, shallow pavilion diamond of the invention illustrating its measured light reflecting and refracting properties
- FIG. 7 is a top plan view of a first cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention.
- FIG. 7A is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention.
- FIG. 7B is a top plan view of a second cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention.
- FIG. 7C is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention.
- FIG. 7D is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention.
- FIG. 8 is a bottom plan view of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 7 ;
- FIG. 8B is a bottom plan view of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 7B ;
- FIG. 9 is a side plan view of the short side of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 7 ;
- FIG. 10 is a top plan view of heart shaped, shallow pavilion diamond in accordance with a third embodiment of the invention with the pavilion facets shown with phantom lines;
- FIG. 10A is a top plan view of second heart shaped, shallow pavilion diamond in accordance with a third embodiment of the invention with an alternate arrangement of crown facets and an alternate arrangement of pavilion facets shown with phantom lines;
- FIG. 11 is a side plan view of the short side of the heart shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 10 ;
- FIG. 12 is an enlarged, side plan view of the long side of the heart shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 10 ;
- FIG. 13 is a top plan view of a pear shaped, shallow pavilion diamond in accordance with a fourth embodiment of the invention.
- FIG. 14 is a bottom plan view of a pear shaped, shallow pavilion diamond in accordance with the embodiment of FIG. 13 ;
- FIG. 14A is a top plan view of a pear shaped, shallow pavilion diamond illustrating an alternate arrangement of pavilion facets for a diamond in accordance with the third embodiment of the invention
- FIG. 15 is an enlarged, side plan view of the long side of the pear shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 13 ;
- FIG. 16 is a side plan view of the short side of the pear shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 13 ;
- FIG. 17 is an enlarged, top plan view of an oval shaped, shallow pavilion diamonds in accordance with a fifth embodiment of the invention.
- FIG. 18 is an enlarged, top plan view of an oval shaped, shallow pavilion diamond with the pavilion facets shown in phantom lines in accordance with the embodiment of FIG. 17 ;
- FIG. 19 is a side plan view of the long side of the oval shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 17 ;
- FIG. 20 is a side plan view of the short side of the oval shaped, shallow pavilion diamond of the invention in accordance with the embodiment of FIG. 17 .
- FIGS. 1-3 show a shallow pavilion, round cut diamond 20 having a table 22 , a crown 24 extending downwardly from the table 22 , a girdle 32 below the crown 24 , and a pavilion 26 extending downwardly from the girdle 32 .
- the surface of the pavilion 26 narrows in width to a pointed culet 30 .
- FIG. 3 shows that the pavilion 26 extending at a distinct pavilion angle ( ⁇ P) relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond stone.
- the crown angle ( ⁇ C) is also indicated on FIG. 3 .
- the crown 24 and pavilion 26 portions of the round, shallow pavilion diamond 20 are separated by a narrow, substantially annular girdle portion 32 .
- the girdle 32 is preferably either a polished single annular surface or can be multi-faceted with the multiple small facets approximating an annular surface (not shown).
- the crown 24 of the round cut diamond 20 of the invention is comprised of a total of thirty-three facets, including a single table facet 22 , eight bezel facets 21 , eight star facets 23 , and sixteen upper girdle facets 25 .
- the pavilion 26 comprises a total of twenty-five facets including sixteen lower girdle facets 27 , eight main pavilion facets 29 , and a single pointed culet 30 as shown in FIG. 3 .
- the crown angle is measured between the surface of each of the bezel facets 21 and the plane of the table 22 (average of each measured angle for the bezel facets).
- the pavilion angle is measured between the plane of the table 22 and main pavilion facets 29 .
- the pavilion 26 narrows to a pointed culet 30 , that is a preferably “true point,” that is, a very sharp point as shown in FIG. 3 .
- the point culet 30 may be a less sharply pointed culet (not shown), which would have either a slightly larger flattened surface area than a “true point” or a slightly rounded or beveled surface defining a portion of such a culet.
- the present inventor has discovered that at least equivalent reflection pattern can be obtained by providing a round, shallow pavilion diamond with a very shallow pavilion, namely by forming the pavilion angles in the range of twenty five to thirty six degrees, preferably thirty to thirty two degrees, as opposed to the conventional pavilion angles which are in the range of 40 to 43 degrees.
- the round, shallow pavilion diamonds of the invention provide a stone with the same top down view and at least equivalent optical characteristics to the prior art round, brilliant cut diamonds of significantly higher carat weight.
- the round, shallow pavilion diamonds have a carat weight that is between 10% and 20% (typically 16%-18%) less than a matched diameter prior art, round brilliant cut diamonds.
- the shallow pavilion diamonds of the present invention can realize unexpected brilliance and light amplification characteristics with total depth percentage in a range from about twenty five percent to about fifty percent. This contrast with the total depth percentage range of between 55 to 64 percent for prior art round, brilliant cut diamonds.
- the maximum and minimum crown angles for the shallow pavilion, round diamonds of the invention are between about thirty two degrees and thirty six degrees with the preferred crown angles ranging from thirty three to thirty five degrees.
- Table 1 below provides the relevant parameters for the round, shallow pavilion diamonds of the invention, indicating in each instance a minimum value, a maximum value and a preferred range.
- FIGS. 5 and 6 illustrate the measured light reflection patterns from a shallow pavilion, round cut diamond of the first embodiment of the invention ( FIG. 6 ) and from a conventional prior art, round brilliant cut diamond ( FIG. 5 ).
- a ray of light that strikes the table perpendicularly hits the pavilion at one side, is then reflected to the opposed pavilion side and eventually reflected back out through the table with only a small portion of the light traversing the volume between the other internal surfaces of the diamond.
- the total light transmitted back from the table for the OGI Systems Ltd. CFireTM optical performance test is 68% as can be seen in FIG. 5 .
- the light pattern for round, shallow pavilion cut diamond 20 of the invention follows a path whereby light is reflected from one pavilion surface to an opposed crown surface, then another pavilion surface, then to the table, then back to a pavilion surface, then to the crown, then to an opposed pavilion surface and only then out to the table.
- This light pattern with light rays being repeatedly reflected and refracted between many diamond surfaces creates an unexpectedly brilliant light display for a shallow pavilion, round cut diamond.
- the light transmitted from the table 22 of the shallow pavilion, round diamond 20 during the OGI Systems Ltd. CFireTM optical performance test is an impressive 69% as illustrated in FIG. 6 . This is slightly better than for the round, brilliant cut diamond of FIG.
- the crown angle for the prior art round, brilliant cut diamond shown in FIG. 4 is about thirty five degrees and the pavilion angle is about forty one degrees.
- the total depth percentage for the prior art diamond of FIG. 4 is about 60% and is calculated as the ratio of the height divided by the width (diameter) of the stone.
- the table percentage for the prior art diamond of FIG. 4 is about 53% and is calculated relative to the diameter of the stone.
- the corresponding values for a round, shallow pavilion cut diamonds of the present invention are set forth in the Table 1 above. As can be discerned from a comparison of the side view shown in FIG. 3 and FIG. 4 , the shallow pavilion, round diamond 20 of the invention has a significantly more shallow total depth, which results from the shallow pavilion angles of the diamond of the present invention.
- FIGS. 7-20 a variety of shallow pavilion, fancy cut diamonds are provided four embodiments of which are illustrated in FIGS. 7-20 .
- the four illustrated embodiments of the shallow pavilion, fancy cut diampngs include cusion shaped, cut diamonds 120 , 120 B ( FIGS. 7-9B ); heart shaped, cut diamonds 220 , 220 A ( FIGS. 10-12 ); pear shaped, cut diamonds 320 ( FIGS. 13-16 ); and oval cut diamond 420 ( FIGS. 17-20 ), respectively.
- the shallow pavilion, pointed culet, fancy cut diamonds of the invention may also be asher cut, calf cut, emerald shaped, half-moon shaped, marquise, princess cut, radiant cut, straight baguette, and trillion shaped.
- Table 2 below provides the relevant parameters for the shallow pavilion, fancy cut diamonds of the invention, indicating in each instance a minimum value, a maximum value and a preferred range.
- the diamond 120 has a table 122 , a crown 124 extending downwardly from the table 122 , a girdle 132 located below the crown 124 , a pavilion 126 extending downwardly from the girdle 132 , the pavilion 126 surface narrowing in width to a pointed culet 130 .
- FIG. 9 shows that the pavilion 126 extends at a distinct pavilion angle, within the range set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond.
- the crown angle is also within the range set forth in Table 2.
- the crown 124 and pavilion 126 portions of the cushion shaped, shallow pavilion diamond 120 are separated by a narrow girdle portion 132 .
- the girdle 132 shown in FIG. 9 is multi-faceted with tiny facets approximating rounded cushion shape, but girdle may also be a smooth polished cushion shape (not shown).
- the shallow pavilion, cushion shaped diamond 120 of the invention is comprised of a total of 64 facets.
- the crown 124 has 37 facets including a single table facet 122 , eight bezel facets 121 , twelve star facets 123 , and sixteen upper girdle facets 125 .
- the pavilion 126 comprises a total of twenty seven facets including twenty lower girdle facets 127 , six main pavilion facets 129 , and a single pointed culet 130 as best seen in FIG. 8 .
- the crown angle is measured between the surface of each of the bezel facets 121 and the plane of the table 122 (average of each measured angle for the bezel facets).
- the pavilion angle is measured between the plane of the table 122 and main pavilion facets 129 .
- the pointed culet 130 may be a less than razor sharp such as shown with shallow angle pointed culet 130 shown in FIG. 9 .
- the pavilion 126 may narrow to a sharper pointed culet 130 that is a “true point,” that is, a very sharp point (not shown).
- FIG. 7A illustrates an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond of the invention.
- the alternate crown 124 A includes table facet 122 A, eight bezel facets 121 A, fourteen star facet 123 A, and sixteen upper girdle facets 125 A.
- FIGS. 7C and 7D similarly illustrate additional alternate crown facet arrangement for shallow pavilion, cushion cut diamonds of the invention.
- Crowns 124 C, 124 D each have a single table facet 122 C, 122 D; four bezel facets 121 C, 121 D; eight star facets 123 C, 123 D; and eight upper girdle facets 125 C, 125 D, respectively.
- the crown angle, crown height, girdle height for the alternate crowns 124 A, 124 C, 124 D are within the parameters set for in Table 2.
- FIGS. 7B and 8B illustrate a more elongated shallow pavilion, cushion cut diamond 120 B in accordance with the invention.
- the shallow pavilion, cushion cut diamond 120 B has a crown 124 B having a single table facet 122 B, ten bezel facets 121 B, sixteen star facets 123 B, and twenty upper girdle facets 125 B.
- the pavilion 126 B comprises a total of twenty-nine facets including twenty lower girdle facets 127 B, eight main pavilion facets 129 B, and a pointed culet 130 B.
- the crown angle, crown height, girdle height, pavilion angle, table percentage, and total depth percentage for the shallow pavilion, cushion cut diamonds 120 and 120 B are all within the parameters set for in Table 2 above.
- the present inventor has discovered that a brilliant-like reflection pattern can be obtained by providing a cushion shaped, cut diamond and other fancy cut diamond shapes with a shallow pavilion angle combined with a pointed culet at the bottom of the pavilion.
- the pavilion angles for the fancy cut diamonds of the invention range between twenty five to thirty four and one half degrees, preferably between thirty to thirty two degrees.
- the maximum and minimum crown angles for the shallow pavilion, fancy cut diamonds of the invention are between about twenty nine degrees and about thirty four and one half degrees.
- the crown angle for the shallow pavilion, fancy cut diamonds of the invention are preferably in the range of from thirty and thirty five degrees.
- the light pattern for shallow pavilion, fancy cut diamonds 120 , 120 B, 220 , 220 A, 320 and 420 of the invention follows a path whereby light is reflected from one pavilion surface to an opposed crown surface, then to another pavilion surface, then to the table, then back to a pavilion surface, then to the crown, then to an opposed pavilion surface and only then out to the table in a manner similar to that shown above in FIG. 6 for the round, shallow pavilion diamond 20 of the invention.
- This light pattern with light rays being repeatedly reflected and refracted between many internal diamond surfaces of the shallow pavilion diamond of the invention creates an extremely brilliant light display when compared to traditional deep pavilion, fancy diamonds.
- the light transmitted from the table of the shallow pavilion, fancy cut diamonds 120 , 120 B, 220 , 220 A, 320 , and 420 is quite brilliant and is visually similar to that measured for the round, shallow pavilion diamond 20 of the invention discussed above and illustrated in FIG. 6 .
- FIGS. 10-12 illustrate a heart shaped, shallow pavilion diamond 220 in accordance with the invention.
- the heart shaped, shallow pavilion diamond 220 has a table 222 , a crown 224 extending downwardly from the table 222 , a girdle 232 located below the crown 224 , and a pavilion 226 extending downwardly from the girdle 232 .
- the pavilion 226 surface narrows in width to a pointed culet 230 .
- FIG. 12 shows that the pavilion 226 extends at a shallow pavilion angle within the range set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is also within the ranges listed in Table 2.
- the crown 224 and pavilion 226 portions of the heart shaped, shallow pavilion diamond 220 are separated by a narrow girdle portion 232 .
- the girdle 232 best seen in FIG. 12 is a smooth polished heart shaped band, but may also be multi-faceted with tiny facets approximating a heart shaped band (not shown).
- the heart shaped, shallow pavilion diamond 220 of the invention is comprised of a total of 56 facets.
- the crown 224 has 32 facets including a single table facet 222 , eight bezel facets 221 , eight star facets 223 , and fifteen upper girdle facets 225 .
- the pavilion 226 comprises a total of twenty four facets including sixteen lower girdle facets 227 , seven main pavilion facets 229 , and a single pointed culet 230 as best seen in FIGS. 10 and 12 .
- the crown angle is measured between the surface of each of the bezels facets 221 and the plane of the table 222 (average of each measured angle for the bezel facets).
- the pavilion angle is measured between the plane of the table 222 and main pavilion facets 229 .
- the pointed culet 230 may be a less than sharp such as shown with slightly pointed beveled culet 230 shown in FIGS. 11-12 .
- the pavilion 226 may narrow to a pointed culet that is a “true point”, that is, a very sharp point (not shown).
- FIG. 10A illustrates an alternate facet configuration for a shallow pavilion, heart shaped diamond 220 A in accordance with the invention.
- the shallow pavilion, heart shaped diamond 220 A has a total of 52 facets.
- the crown 224 A has 35 facets including a single table facet 222 A, nine bezel facets 221 A, nine star facets 223 A, and sixteen upper girdle facets 225 A.
- the pavilion 226 A comprises a total of twenty-seven facets, including eighteen lower girdle facets 227 A, eight main pavilion facets 229 A, and a single pointed culet 230 A.
- the shallow pavilion, heart shaped diamond of FIGS. 10 and 10A have crown angles, crown heights, girdle heights, pavilion angles, table width percentage, and total depth percentage within the parameters set forth in Table 2.
- FIGS. 13-16 illustrate a pear shaped, shallow pavilion diamond 320 of the invention.
- the pear shaped cut diamond 320 has a table 322 , a crown 324 extending downwardly from the table 322 , a girdle 332 located below the crown 324 , and a pavilion 326 extending downwardly from the girdle 332 .
- the pavilion 326 surface narrows in width to a pointed culet 330 .
- FIGS. 15-16 show that the pavilion 326 extends at a shallow pavilion angle within the parameters set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is within the parameters set forth in Table 2 above.
- the crown 324 and pavilion 326 portions of the cushion, cut diamond 320 are separated by a narrow girdle portion 332 .
- the girdle 332 best seen in FIG. 15-16 is a smooth polished pear shaped band, but may also be multi-faceted with tiny facets approximating a pear shaped band (not shown).
- the pear shaped, shallow pavilion diamond 320 of the invention is comprised of a total of 56 facets.
- the crown 324 has 33 facets including a single table facet 322 , eight bezel facets 321 , eight star facets 323 , and sixteen upper girdle facets 325 .
- the pavilion 326 comprises a total of 23 facets including sixteen lower girdle facets 327 , six main pavilion facets 329 , and a single pointed culet 330 as best seen in FIGS. 14-16 .
- the crown angle is measured between the surface of each of the bezel facets 321 and the plane of the table 322 (average of each measured angle for the bezel facets).
- the pavilion angle is measured between the plane of the table 322 and main pavilion facets 329 .
- the pointed culet 330 may be a less than sharp such as shown with pointed culet 330 shown in FIGS. 13-16 .
- the pavilion 326 may narrow to a more sharply pointed culet (not shown).
- FIG. 14A illustrates an alternate pavilion facet arrangement for use in a pear shaped, shallow pavilion diamond of the invention.
- the alternate pavilion 326 A comprises a total of 21 facets including sixteen upper girdle facets 327 A, four main pavilion facets 329 A and one pointed culet 330 A.
- the crown angle, crown height, girdle height, pavilion angle, table percentage, and total depth percentage of the pear shaped, shallow pavilion diamond 320 and the pavilion angle, table width percentage, and total depth percentage for the alternate pavilion 326 A all fall within the parameters set forth in Table 2.
- FIGS. 17-20 illustrate an oval shaped, shallow pavilion diamond 420 of the invention.
- the oval shaped cut diamond 420 has a table 422 , a crown 424 extending downwardly from the table 422 , a girdle 432 located below the crown 424 , and a pavilion 426 extending downwardly from the girdle 432 .
- the pavilion 426 surface narrows in width to a pointed culet 330 .
- FIGS. 19-20 show that the pavilion 426 extends at a shallow pavilion angle within the parameters set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is within the parameters set forth in Table 2 above.
- the crown 424 and pavilion 426 portions of the oval shaped, shallow pavilion diamond 420 are separated by a narrow girdle portion 432 .
- the girdle 432 best seen in FIGS. 19-20 is a smooth polished oval shaped band, but may also be multi-faceted with tiny facets approximating an oval shaped band (not shown).
- the crown angle, crown height, girdle height, pavilion angle, table width percentage, and total depth percentage of the oval shaped, shallow pavilion diamond 420 fall within the parameters set forth in Table 2.
- the oval shaped, shallow pavilion diamond 420 of the invention is comprised of a total of 58 facets.
- the crown 424 has a total of 33 facets including a single table facet 422 , eight bezel facets 421 , eight star facets 423 , and sixteen upper girdle facets 425 .
- the pavilion 426 comprises a total of twenty-five facets including sixteen lower girdle facets 427 , eight main pavilion facets 429 , and a single pointed culet 430 as best seen in FIGS. 18-20 .
- the crown angle is measured between the surface of each of the bezel facets 421 and the plane of the table 422 (average of each measured angle for the bezel facets).
- the pavilion angle is measured between the plane of the table 422 and main pavilion facets 429 .
- the pointed culet 430 may be a less than sharp such as shown with pointed culet 430 shown in FIGS. 19-20 . Alternately, the pavilion 426 may narrow to a more sharply pointed culet (not shown).
- the crown angle, crown height, girdle height, pavilion angle, table width percentage, and total depth percentage of the oval shaped, shallow pavilion diamond 420 fall within the parameters set forth in Table 2.
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Abstract
The invention is directed to shallow pavilion, cut diamonds having excellent optical characteristics. The shallow pavilion cut diamonds of the invention have a table with a table plane and a girdle. The cut diamonds have a shape and configuration that result in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage. A crown surface is located between the table and the girdle and extends in a crown angle to the table plane. A pavilion surface extends at a pavilion angle relative to the table. The pavilion surface includes a plurality of substantially planar main pavilion facets, each of which extend from the girdle to a pointed culet defining the bottom most portion of the cut diamond. The crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees. The shallow pavilion, cut diamonds of the invention may be either round shaped cut diamonds or fancy shaped cut diamonds.
Description
- This application is a U.S. National Phase application of PCT/US17/54798 filed Oct. 2, 2017, and claims priority to U.S. application Ser. No. 15/283,194 filed Sep. 30, 2016, which are incorporated herein in their entirety by reference.
- The invention is directed to finished cut diamonds that have both excellent optical characteristics and exceptionally high yield for the finished stones. More specifically, the present invention provides both round and fancy shallow pavilion cut diamonds with exceptional optical characteristics.
- In the United States market, the round, brilliant cut has been the round diamond market standard since it was developed by Marcel F. Tolkowsky in 1919. The round, brilliant cut and most other popular round cut diamonds include a relatively tall crown height, steep pavilion angle, and high total depth percentage. As a result, the girdle diameter of these stones is relatively small in comparison to their pavilion depth and the total depth of the stone. While prior art round, brilliant cut diamonds have excellent optical characteristics, their tall crown height requires a relatively high stone weight for a cut diamond of a given girdle diameter. For some rough diamond stones, this tall crown height can result in a higher than optimal loss of weight during the cutting and polishing process when converting the rough diamonds to finished stones.
- Some rough diamonds, having a depth of less than about 3 mm (known in the trade as “flat stones”), are too shallow for cost efficient cutting into round, brilliant cut diamonds. The strong market preference for deep pavilion round, brilliant cut finished diamonds has rendered such flat stones (low overall depth) nearly unmarketable for use in creating high optical quality round, brilliant cut finished diamonds. One of the reasons round, brilliant cut diamonds utilize steep pavilion angles was the belief that deep pavilions were necessary to avoid the optical characteristic known in the trade as the “fish eye effect.” This optical effect occurs when light loss from within one or more of the diamond's internal surfaces are sufficient that the table, when viewed from above, includes one or more areas that are substantially darker than the rest of the diamond. Such darkened “fish eye” areas are considered to be highly undesirable in a cut, finished diamond.
- For similar reasons, prior art fancy cut diamonds (non-round shaped) have traditionally had relatively steep pavilion angles in order to avoid inferior optical characteristics, such as the “fish eye” effect, in the finished fancy diamond. Similar to the case with the prior art round brilliant cut diamonds, the steep pavilion angles and relatively tall crown heights of the prior art fancy cut diamonds resulted in higher than optimal loss of weight (low cut weight yield) during the cutting and polishing processes.
- Surprisingly, the applicant has found that cut diamonds with relatively shallow pavilion angle cuts combined with the other parameters set forth below have optical characteristics that are at least equivalent to, and often superior to, the prior art standard fancy cuts and round, brilliant cut diamonds. Moreover, due to their shallow pavilion depth, the cutting and polishing weight loss is significantly reduced for many rough stones. Further, the higher proportion of girdle diameter (round cut) or surface area (fancy cut) to stone weight provides the visual impression to consumers that the stone is significantly larger than its actual carat weight. Moreover, the applicant has discovered that round, cut diamonds with excellent optical characteristics may be cost efficiently cut from “flat stones,” which can further reduce the cost of the round, shallow pavilion cut stones of the invention relative to the round, brilliant cut diamonds of the prior art.
- It is an object of the invention to provide a shallow pavilion angle round, cut diamond that has good sparkle characteristics.
- It is an object of the invention to provide a shallow pavilion angle fancy, cut diamond that has good sparkle characteristics.
- Another object of the invention to provide a shallow pavilion cut diamond with enhanced light reflection amplification.
- It is another object of the invention to provide a cut diamond with good optical characteristics that appears, when viewed from above, to be larger/heavier than its actual size/weight of the cut stone.
- It is a still further object of the invention to provide round, cut diamonds that have significantly higher cut weight yield relative to the prior art round, brilliant cut diamonds.
- It is another object of the invention to provide high optical quality round cut, diamonds from so called rough “flat stone” diamonds.
- In a first preferred embodiment, the invention includes a cut diamond having a round shape. The round cut diamond including a table having a table plane and a substantially annular girdle. The round cut diamond has a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage. A crown surface is located between the table and the substantially annular girdle and extends in a crown angle to the table plane. A pointed culet defines the bottom most portion of the round cut diamond. A pavilion surface extends at a pavilion angle relative to the table. The crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 25 degrees and about 36 degrees.
- The invention further includes fancy cut diamonds with a table having a table plane and a girdle having a non-circular circumference. The fancy cut diamonds have a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage. A crown surface is located between the table and the girdle and extends in a crown angle to the table plane. A pavilion surface extends at a pavilion angle relative to the table. The pavilion surface includes a plurality of substantially planar main pavilion facets each of which extend from the girdle having a non-circular circumference to a pointed culet defining the bottom most portion of the cut diamond. The crown angle is in the range of between about 29 degrees to about 36 degrees and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees. For the purposes of this application, the phrase “fancy cut diamond” includes all cut diamond shapes that are other than substantially round (when viewed from above), shaped diamonds.
- In another aspect, the present invention is further directed to cut diamonds having a table with a table plane and a girdle. The cut diamonds have a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage. A crown surface is located between the table and the girdle and extends in a crown angle to the table plane. A pavilion surface extends at a pavilion angle relative to the table. The pavilion surface includes a plurality of substantially planar main pavilion facets, each of which extend from the girdle to a pointed culet defining the bottom most portion of the cut diamond. The crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees. The cut diamonds in accordance with this aspect of the invention may be either round shaped cut diamonds or fancy shaped cut diamonds.
- The organization and manner of the structure and function of the invention, together with the further objects and advantages thereof, may be understood by reference to the following description taken in connection with the accompanying drawings, and in which:
-
FIG. 1 is a top plan view of a round, shallow pavilion diamond in accordance with a first embodiment of the invention; -
FIG. 2 is a bottom plan view of a round, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 1 ; -
FIG. 3 is a side plan view of a round, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 1 ; -
FIG. 4 is a side plan view of a prior art round, brilliant cut diamond; -
FIG. 5 is a side plan view of a prior art round, brilliant cut diamond illustrating its measured light reflecting and refracting properties; -
FIG. 6 is a side plan view of a round, shallow pavilion diamond of the invention illustrating its measured light reflecting and refracting properties; -
FIG. 7 is a top plan view of a first cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention; -
FIG. 7A is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention; -
FIG. 7B is a top plan view of a second cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention; -
FIG. 7C is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention; -
FIG. 7D is a top plan view of an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond in accordance with a second embodiment of the invention; -
FIG. 8 is a bottom plan view of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 7 ; -
FIG. 8B is a bottom plan view of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 7B ; -
FIG. 9 is a side plan view of the short side of the cushion shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 7 ; -
FIG. 10 is a top plan view of heart shaped, shallow pavilion diamond in accordance with a third embodiment of the invention with the pavilion facets shown with phantom lines; -
FIG. 10A is a top plan view of second heart shaped, shallow pavilion diamond in accordance with a third embodiment of the invention with an alternate arrangement of crown facets and an alternate arrangement of pavilion facets shown with phantom lines; -
FIG. 11 is a side plan view of the short side of the heart shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 10 ; -
FIG. 12 is an enlarged, side plan view of the long side of the heart shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 10 ; -
FIG. 13 is a top plan view of a pear shaped, shallow pavilion diamond in accordance with a fourth embodiment of the invention; -
FIG. 14 is a bottom plan view of a pear shaped, shallow pavilion diamond in accordance with the embodiment ofFIG. 13 ; -
FIG. 14A is a top plan view of a pear shaped, shallow pavilion diamond illustrating an alternate arrangement of pavilion facets for a diamond in accordance with the third embodiment of the invention; -
FIG. 15 is an enlarged, side plan view of the long side of the pear shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 13 ; -
FIG. 16 is a side plan view of the short side of the pear shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 13 ; -
FIG. 17 is an enlarged, top plan view of an oval shaped, shallow pavilion diamonds in accordance with a fifth embodiment of the invention; -
FIG. 18 is an enlarged, top plan view of an oval shaped, shallow pavilion diamond with the pavilion facets shown in phantom lines in accordance with the embodiment ofFIG. 17 ; -
FIG. 19 is a side plan view of the long side of the oval shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 17 ; and -
FIG. 20 is a side plan view of the short side of the oval shaped, shallow pavilion diamond of the invention in accordance with the embodiment ofFIG. 17 . - In accordance with a first embodiment of the invention,
FIGS. 1-3 show a shallow pavilion, round cutdiamond 20 having a table 22, acrown 24 extending downwardly from the table 22, agirdle 32 below thecrown 24, and apavilion 26 extending downwardly from thegirdle 32. The surface of thepavilion 26 narrows in width to apointed culet 30.FIG. 3 shows that thepavilion 26 extending at a distinct pavilion angle (<P) relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond stone. Similarly, the crown angle (<C) is also indicated onFIG. 3 . Thecrown 24 andpavilion 26 portions of the round,shallow pavilion diamond 20 are separated by a narrow, substantiallyannular girdle portion 32. Thegirdle 32 is preferably either a polished single annular surface or can be multi-faceted with the multiple small facets approximating an annular surface (not shown). - More specifically, as can be seen in
FIGS. 1-3 , thecrown 24 of theround cut diamond 20 of the invention is comprised of a total of thirty-three facets, including asingle table facet 22, eightbezel facets 21, eightstar facets 23, and sixteenupper girdle facets 25. Thepavilion 26 comprises a total of twenty-five facets including sixteenlower girdle facets 27, eightmain pavilion facets 29, and a single pointedculet 30 as shown inFIG. 3 . The crown angle is measured between the surface of each of thebezel facets 21 and the plane of the table 22 (average of each measured angle for the bezel facets). The pavilion angle is measured between the plane of the table 22 andmain pavilion facets 29. Thepavilion 26 narrows to apointed culet 30, that is a preferably “true point,” that is, a very sharp point as shown inFIG. 3 . However, thepoint culet 30 may be a less sharply pointed culet (not shown), which would have either a slightly larger flattened surface area than a “true point” or a slightly rounded or beveled surface defining a portion of such a culet. - In marked departure from the prior art round, brilliant cut diamonds, the present inventor has discovered that at least equivalent reflection pattern can be obtained by providing a round, shallow pavilion diamond with a very shallow pavilion, namely by forming the pavilion angles in the range of twenty five to thirty six degrees, preferably thirty to thirty two degrees, as opposed to the conventional pavilion angles which are in the range of 40 to 43 degrees. Put another way, when matched for diamond diameter and viewed from above, the round, shallow pavilion diamonds of the invention provide a stone with the same top down view and at least equivalent optical characteristics to the prior art round, brilliant cut diamonds of significantly higher carat weight. The round, shallow pavilion diamonds have a carat weight that is between 10% and 20% (typically 16%-18%) less than a matched diameter prior art, round brilliant cut diamonds. Furthermore, the shallow pavilion diamonds of the present invention can realize unexpected brilliance and light amplification characteristics with total depth percentage in a range from about twenty five percent to about fifty percent. This contrast with the total depth percentage range of between 55 to 64 percent for prior art round, brilliant cut diamonds. The maximum and minimum crown angles for the shallow pavilion, round diamonds of the invention are between about thirty two degrees and thirty six degrees with the preferred crown angles ranging from thirty three to thirty five degrees.
- Table 1 below provides the relevant parameters for the round, shallow pavilion diamonds of the invention, indicating in each instance a minimum value, a maximum value and a preferred range.
-
TABLE 1 ANGLE AND PERCENTAGE PARAMETERS FOR ROUND CUT DIAMONDS PARAMETER MINIMUM PREFERRED RANGE MAXIMUM Crown Angle° 29 33-35 36 Crown Height % 7 9-12 15 Girdle Height % 1 1.5-5 7 Pavilion Angle° 25 30-33 36 Table % 55 66.5-85 85 Total Depth % 25 35-47 50 -
FIGS. 5 and 6 illustrate the measured light reflection patterns from a shallow pavilion, round cut diamond of the first embodiment of the invention (FIG. 6 ) and from a conventional prior art, round brilliant cut diamond (FIG. 5 ). In the round, brilliant cut diamond of the prior art shown inFIG. 5 , a ray of light that strikes the table perpendicularly hits the pavilion at one side, is then reflected to the opposed pavilion side and eventually reflected back out through the table with only a small portion of the light traversing the volume between the other internal surfaces of the diamond. As a result, the total light transmitted back from the table for the OGI Systems Ltd. CFire™ optical performance test is 68% as can be seen inFIG. 5 . - In contrast to the prior art, the light pattern for round, shallow pavilion cut
diamond 20 of the invention, follows a path whereby light is reflected from one pavilion surface to an opposed crown surface, then another pavilion surface, then to the table, then back to a pavilion surface, then to the crown, then to an opposed pavilion surface and only then out to the table. This light pattern, with light rays being repeatedly reflected and refracted between many diamond surfaces creates an unexpectedly brilliant light display for a shallow pavilion, round cut diamond. As a result of the repeated reflection and refraction, the light transmitted from the table 22 of the shallow pavilion,round diamond 20 during the OGI Systems Ltd. CFire™ optical performance test is an impressive 69% as illustrated inFIG. 6 . This is slightly better than for the round, brilliant cut diamond ofFIG. 5 even though when matched for diameter conventional brilliant cut, diamonds weigh between 10-20% more than the round, shallow pavilion diamond of the invention. The crown angle, crown height, girdle height, pavilion angle, table percentage and total depth for theshallow pavilion stone 20 all fall within the ranges set forth in Table 1. - The crown angle for the prior art round, brilliant cut diamond shown in
FIG. 4 is about thirty five degrees and the pavilion angle is about forty one degrees. The total depth percentage for the prior art diamond ofFIG. 4 is about 60% and is calculated as the ratio of the height divided by the width (diameter) of the stone. The table percentage for the prior art diamond ofFIG. 4 is about 53% and is calculated relative to the diameter of the stone. The corresponding values for a round, shallow pavilion cut diamonds of the present invention are set forth in the Table 1 above. As can be discerned from a comparison of the side view shown inFIG. 3 andFIG. 4 , the shallow pavilion,round diamond 20 of the invention has a significantly more shallow total depth, which results from the shallow pavilion angles of the diamond of the present invention. As a result of utilizing that shallow pavilion angle and other parameters set forth in Table 1, the applicant has found that final cut and polished stones of the invention routinely provide a yield of between fifty to fifty-five percent relative to the rough diamonds from which they are cut. In many cases, the so called rough “flat stones” may be utilized to create the shallow pavilion, round cut diamonds of the invention, thereby further reducing the cost of an excellent optical quality round diamond of a given diameter. In contrast, the prior art round, brilliant cut diamond (e.g., as shown inFIG. 4 ) have a typical finished cut/polished stone to rough stone yields in the range from about thirty-five percent to about forty percent and usually required more expensive deep (cubic) raw stones. - In accordance with another aspect of the invention, a variety of shallow pavilion, fancy cut diamonds are provided four embodiments of which are illustrated in
FIGS. 7-20 . The four illustrated embodiments of the shallow pavilion, fancy cut diampngs include cusion shaped, cutdiamonds FIGS. 7-9B ); heart shaped, cutdiamonds FIGS. 10-12 ); pear shaped, cut diamonds 320 (FIGS. 13-16 ); and oval cut diamond 420 (FIGS. 17-20 ), respectively. While the illustrations herein shows the four most common fancy cut diamond shapes, the shallow pavilion, pointed culet, fancy cut diamonds of the invention may also be asher cut, calf cut, emerald shaped, half-moon shaped, marquise, princess cut, radiant cut, straight baguette, and trillion shaped. Table 2 below provides the relevant parameters for the shallow pavilion, fancy cut diamonds of the invention, indicating in each instance a minimum value, a maximum value and a preferred range. -
TABLE 2 ANGLE AND PERCENTAGE PARAMETERS FOR FANCY CUT DIAMONDS PARAMETER MINIMUM PREFERRED RANGE MAXIMUM Crown Angle° 29 30-35 36 Crown Height % 7 9-12 15 Girdle Height % 1 1.5-5 7 Pavilion Angle° 15 22-33 34.5 Table % 50 60-85 90 Total Depth % 25 33-43 55 - Turning to the cushion shaped,
shallow pavilion diamond 120 of the invention shown inFIG. 7-9 , thediamond 120 has a table 122, acrown 124 extending downwardly from the table 122, agirdle 132 located below thecrown 124, apavilion 126 extending downwardly from thegirdle 132, thepavilion 126 surface narrowing in width to apointed culet 130.FIG. 9 shows that thepavilion 126 extends at a distinct pavilion angle, within the range set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is also within the range set forth in Table 2. Thecrown 124 andpavilion 126 portions of the cushion shaped,shallow pavilion diamond 120 are separated by anarrow girdle portion 132. Thegirdle 132 shown inFIG. 9 is multi-faceted with tiny facets approximating rounded cushion shape, but girdle may also be a smooth polished cushion shape (not shown). - More specifically, as can be seen in
FIGS. 7-9 , the shallow pavilion, cushion shapeddiamond 120 of the invention is comprised of a total of 64 facets. Thecrown 124 has 37 facets including asingle table facet 122, eightbezel facets 121, twelvestar facets 123, and sixteenupper girdle facets 125. Thepavilion 126 comprises a total of twenty seven facets including twentylower girdle facets 127, sixmain pavilion facets 129, and a singlepointed culet 130 as best seen inFIG. 8 . The crown angle is measured between the surface of each of thebezel facets 121 and the plane of the table 122 (average of each measured angle for the bezel facets). The pavilion angle is measured between the plane of the table 122 andmain pavilion facets 129. Thepointed culet 130 may be a less than razor sharp such as shown with shallow angle pointedculet 130 shown inFIG. 9 . Alternately, thepavilion 126 may narrow to a sharperpointed culet 130 that is a “true point,” that is, a very sharp point (not shown). -
FIG. 7A illustrates an alternate crown facet arrangement for a cushion shaped, shallow pavilion diamond of the invention. The alternate crown 124A includestable facet 122A, eightbezel facets 121A, fourteenstar facet 123A, and sixteenupper girdle facets 125A.FIGS. 7C and 7D similarly illustrate additional alternate crown facet arrangement for shallow pavilion, cushion cut diamonds of the invention. Crowns 124C, 124D each have asingle table facet bezel facets star facets upper girdle facets -
FIGS. 7B and 8B illustrate a more elongated shallow pavilion, cushion cutdiamond 120B in accordance with the invention. The shallow pavilion, cushion cutdiamond 120B has a crown 124B having asingle table facet 122B, tenbezel facets 121B, sixteenstar facets 123B, and twentyupper girdle facets 125B. The pavilion 126B comprises a total of twenty-nine facets including twentylower girdle facets 127B, eightmain pavilion facets 129B, and apointed culet 130B. The crown angle, crown height, girdle height, pavilion angle, table percentage, and total depth percentage for the shallow pavilion, cushion cutdiamonds - The present inventor has discovered that a brilliant-like reflection pattern can be obtained by providing a cushion shaped, cut diamond and other fancy cut diamond shapes with a shallow pavilion angle combined with a pointed culet at the bottom of the pavilion. The pavilion angles for the fancy cut diamonds of the invention range between twenty five to thirty four and one half degrees, preferably between thirty to thirty two degrees. By utilizing the combination of a pointed culet and shallow pavilion angle in accordance with the fancy cut diamonds of the invention realizes improved brilliance and light amplification characteristics relative to traditional steep pavilion angle fancy cut diamonds of the prior art. The maximum and minimum crown angles for the shallow pavilion, fancy cut diamonds of the invention are between about twenty nine degrees and about thirty four and one half degrees. The crown angle for the shallow pavilion, fancy cut diamonds of the invention are preferably in the range of from thirty and thirty five degrees.
- By adhering to the criteria set forth in the Table 2, the light pattern for shallow pavilion,
fancy cut diamonds FIG. 6 for the round,shallow pavilion diamond 20 of the invention. This light pattern with light rays being repeatedly reflected and refracted between many internal diamond surfaces of the shallow pavilion diamond of the invention creates an extremely brilliant light display when compared to traditional deep pavilion, fancy diamonds. As a result of the repeated reflection and refraction, the light transmitted from the table of the shallow pavilion,fancy cut diamonds shallow pavilion diamond 20 of the invention discussed above and illustrated inFIG. 6 . -
FIGS. 10-12 illustrate a heart shaped,shallow pavilion diamond 220 in accordance with the invention. The heart shaped,shallow pavilion diamond 220 has a table 222, acrown 224 extending downwardly from the table 222, agirdle 232 located below thecrown 224, and apavilion 226 extending downwardly from thegirdle 232. Thepavilion 226 surface narrows in width to apointed culet 230.FIG. 12 shows that thepavilion 226 extends at a shallow pavilion angle within the range set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is also within the ranges listed in Table 2. Thecrown 224 andpavilion 226 portions of the heart shaped,shallow pavilion diamond 220 are separated by anarrow girdle portion 232. Thegirdle 232 best seen inFIG. 12 is a smooth polished heart shaped band, but may also be multi-faceted with tiny facets approximating a heart shaped band (not shown). - The heart shaped,
shallow pavilion diamond 220 of the invention is comprised of a total of 56 facets. Thecrown 224 has 32 facets including asingle table facet 222, eightbezel facets 221, eightstar facets 223, and fifteenupper girdle facets 225. Thepavilion 226 comprises a total of twenty four facets including sixteenlower girdle facets 227, sevenmain pavilion facets 229, and a singlepointed culet 230 as best seen inFIGS. 10 and 12 . The crown angle is measured between the surface of each of thebezels facets 221 and the plane of the table 222 (average of each measured angle for the bezel facets). The pavilion angle is measured between the plane of the table 222 andmain pavilion facets 229. Thepointed culet 230 may be a less than sharp such as shown with slightly pointed beveledculet 230 shown inFIGS. 11-12 . Alternately, thepavilion 226 may narrow to a pointed culet that is a “true point”, that is, a very sharp point (not shown). -
FIG. 10A illustrates an alternate facet configuration for a shallow pavilion, heart shapeddiamond 220A in accordance with the invention. The shallow pavilion, heart shapeddiamond 220A has a total of 52 facets. The crown 224A has 35 facets including a single table facet 222A, ninebezel facets 221A, ninestar facets 223A, and sixteenupper girdle facets 225A. The pavilion 226A comprises a total of twenty-seven facets, including eighteenlower girdle facets 227A, eightmain pavilion facets 229A, and a single pointed culet 230A. The shallow pavilion, heart shaped diamond ofFIGS. 10 and 10A have crown angles, crown heights, girdle heights, pavilion angles, table width percentage, and total depth percentage within the parameters set forth in Table 2. -
FIGS. 13-16 illustrate a pear shaped,shallow pavilion diamond 320 of the invention. The pear shapedcut diamond 320 has a table 322, acrown 324 extending downwardly from the table 322, agirdle 332 located below thecrown 324, and apavilion 326 extending downwardly from thegirdle 332. Thepavilion 326 surface narrows in width to apointed culet 330.FIGS. 15-16 show that thepavilion 326 extends at a shallow pavilion angle within the parameters set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is within the parameters set forth in Table 2 above. Thecrown 324 andpavilion 326 portions of the cushion, cutdiamond 320 are separated by anarrow girdle portion 332. Thegirdle 332 best seen inFIG. 15-16 is a smooth polished pear shaped band, but may also be multi-faceted with tiny facets approximating a pear shaped band (not shown). - The pear shaped,
shallow pavilion diamond 320 of the invention is comprised of a total of 56 facets. Thecrown 324 has 33 facets including asingle table facet 322, eightbezel facets 321, eightstar facets 323, and sixteenupper girdle facets 325. Thepavilion 326 comprises a total of 23 facets including sixteenlower girdle facets 327, sixmain pavilion facets 329, and a singlepointed culet 330 as best seen inFIGS. 14-16 . The crown angle is measured between the surface of each of thebezel facets 321 and the plane of the table 322 (average of each measured angle for the bezel facets). The pavilion angle is measured between the plane of the table 322 andmain pavilion facets 329. Thepointed culet 330 may be a less than sharp such as shown withpointed culet 330 shown inFIGS. 13-16 . Alternately, thepavilion 326 may narrow to a more sharply pointed culet (not shown).FIG. 14A illustrates an alternate pavilion facet arrangement for use in a pear shaped, shallow pavilion diamond of the invention. The alternate pavilion 326A comprises a total of 21 facets including sixteenupper girdle facets 327A, fourmain pavilion facets 329A and one pointedculet 330A. The crown angle, crown height, girdle height, pavilion angle, table percentage, and total depth percentage of the pear shaped,shallow pavilion diamond 320 and the pavilion angle, table width percentage, and total depth percentage for the alternate pavilion 326A all fall within the parameters set forth in Table 2. -
FIGS. 17-20 illustrate an oval shaped,shallow pavilion diamond 420 of the invention. The oval shaped cutdiamond 420 has a table 422, acrown 424 extending downwardly from the table 422, agirdle 432 located below thecrown 424, and apavilion 426 extending downwardly from thegirdle 432. Thepavilion 426 surface narrows in width to apointed culet 330.FIGS. 19-20 show that thepavilion 426 extends at a shallow pavilion angle within the parameters set forth in Table 2 relative to the plane of the table (or to a line parallel to the table passing through the girdle) of the diamond. Similarly, the crown angle is within the parameters set forth in Table 2 above. Thecrown 424 andpavilion 426 portions of the oval shaped,shallow pavilion diamond 420 are separated by anarrow girdle portion 432. Thegirdle 432 best seen inFIGS. 19-20 is a smooth polished oval shaped band, but may also be multi-faceted with tiny facets approximating an oval shaped band (not shown). The crown angle, crown height, girdle height, pavilion angle, table width percentage, and total depth percentage of the oval shaped,shallow pavilion diamond 420 fall within the parameters set forth in Table 2. - The oval shaped,
shallow pavilion diamond 420 of the invention is comprised of a total of 58 facets. Thecrown 424 has a total of 33 facets including asingle table facet 422, eightbezel facets 421, eightstar facets 423, and sixteenupper girdle facets 425. Thepavilion 426 comprises a total of twenty-five facets including sixteenlower girdle facets 427, eightmain pavilion facets 429, and a singlepointed culet 430 as best seen inFIGS. 18-20 . The crown angle is measured between the surface of each of thebezel facets 421 and the plane of the table 422 (average of each measured angle for the bezel facets). The pavilion angle is measured between the plane of the table 422 andmain pavilion facets 429. Thepointed culet 430 may be a less than sharp such as shown withpointed culet 430 shown inFIGS. 19-20 . Alternately, thepavilion 426 may narrow to a more sharply pointed culet (not shown). The crown angle, crown height, girdle height, pavilion angle, table width percentage, and total depth percentage of the oval shaped,shallow pavilion diamond 420 fall within the parameters set forth in Table 2. - Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific embodiments disclosed herein, but only by the appended claims.
Claims (21)
1. A cut diamond having a round shape, the cut diamond comprising:
a table having a table plane and a substantially annular girdle, the cut diamond having a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage;
a crown surface located between the table and the substantially annular girdle and extending in a crown angle to the table plane;
a pointed culet defining the bottom most portion of the cut diamond;
at least three pavilion surfaces, each extending at a pavilion angle relative to the table plane;
and, wherein the crown angle is in the range of 29 degrees to 36 degrees and the pavilion angle is in the range of 25 degrees and 36 degrees.
2. The round cut diamond of claim 1 wherein the total depth percentage is in the range of 25 percent to 50 percent.
3. The round cut diamond of claim 1 wherein the table diameter is in the range of 55 percent to 85 percent.
4. The round cut diamond of claim 1 wherein the crown height is in the range of 7 percent to 15 percent.
5. The round cut diamond of claim 2 wherein the total depth percentage is in the range of 35 percent to 47 percent.
6. The round cut diamond of claim 3 wherein the table diameter is in the range of 66.5 percent to 85 percent.
7. The round cut diamond of claim 4 wherein the crown height is in the range of 9 percent to 12 percent.
8. The round cut diamond of claim 1 wherein the pavilion angle is in the range of 30 degrees to 33 degrees.
9. A fancy cut diamond comprising:
a table having a table plane and having a non-circular circumference girdle, the cut diamond having a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage;
a crown surface located between the table and the girdle having a non-circular circumference and extending in a crown angle to the table plane;
at least three pavilion surfaces, each extending at a pavilion angle relative to the table, the pavilion surfaces include a plurality of substantially planar main pavilion facets, each of the plurality of substantially planar main pavilion facets extend from the girdle having a non-circular circumference to a pointed culet defining the bottom most portion of the cut diamond; and,
wherein the crown angle is in the range of 29 degrees to 36 degrees and the pavilion angle is in the range of 15 degrees and 34.5 degrees.
10. The fancy cut diamond of claim 9 wherein the pavilion angle is in the range of 22 degrees to about 33 degrees.
11. The fancy cut diamond of claim 9 wherein the table diameter is in the range of 60 percent to about 85 percent.
12. The fancy cut diamond of claim 9 wherein the diamond has a pear shape.
13. The cut diamond of claim 9 wherein the diamond has a cushion shape.
14. The fancy cut diamond of claim 9 wherein the diamond has a heart shape.
15. A cut diamond comprising:
a table having a table plane and a girdle, the cut diamond having a shape and configuration that results in a specific total depth percentage, a specific crown height percentage, a specific girdle height percentage and a specific table percentage;
a crown surface located between the table and the girdle and extending in a crown angle to the table plane;
at least four pavilion surfaces, each extending at a pavilion angle relative to the table, the pavilion surfaces includes a plurality of substantially planar main pavilion facets, each of the plurality of substantially planar main pavilion facets extend from the girdle to a pointed culet defining the bottom most portion of the cut diamond; and,
wherein the crown angle is in the range of 29 degrees to 36 degrees and the pavilion angle is in the range of 15 degrees and 34.5 degrees.
16. The cut diamond of claim 15 wherein the total depth is in the range of 25 percent to 55 percent.
17. The cut diamond of claim 15 wherein the table percentage is in the range of 50 percent to 90 percent.
18. The cut diamond of claim 15 wherein the crown height is in the range of 7 percent to 15 percent.
19. The cut diamond of claim 15 wherein the pavilion angle is in the range of 22 degrees and about 33 degrees.
20. The cut diamond of claim 15 wherein the diamond has a round shape.
21. The cut diamond of claim 15 wherein the diamond has an oval shape.
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USD969018S1 (en) * | 2021-06-28 | 2022-11-08 | Koninklijke Asscher Diamant Maatschappij B.V. | Rose pear diamond article |
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