EP2931929B1 - Alloy for the production of jewels - Google Patents

Alloy for the production of jewels Download PDF

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Publication number
EP2931929B1
EP2931929B1 EP13824341.5A EP13824341A EP2931929B1 EP 2931929 B1 EP2931929 B1 EP 2931929B1 EP 13824341 A EP13824341 A EP 13824341A EP 2931929 B1 EP2931929 B1 EP 2931929B1
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EP
European Patent Office
Prior art keywords
weight
gold
alloy
platinum
palladium
Prior art date
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Application number
EP13824341.5A
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German (de)
French (fr)
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EP2931929A1 (en
Inventor
Mario GARFARINO
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Crieri Srl
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Crieri Srl
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Publication date
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Priority to PL13824341T priority Critical patent/PL2931929T3/en
Publication of EP2931929A1 publication Critical patent/EP2931929A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A44C27/003—Metallic alloys

Definitions

  • the invention concerns an alloy for the production of jewels, in particular precious jewels or trinkets.
  • the invention concerns jewels, produced with this alloy.
  • the object of the present invention is to provide an improved alloy that overcomes the drawbacks listed above.
  • the object of the present invention is mainly to propose an alloy with a low precious metal carat rating that, in addition to not oxidizing easily and having good workability, imitates the aspect and the brightness of precious metals and their alloys.
  • the alloys described herein can always contain other elements, meaning elements that are not listed as components that make up the alloy, in the form of inevitable traces. These traces derive from impurities present in the raw materials or are residues of auxiliary materials used during the production or processing of the alloy. In this case, the remaining percentage needed to reach 100% by weight is constituted by copper and inevitable impurities.
  • the traces are present in total quantities not exceeding 0.2% by weight.
  • metals such as gallium and/or indium helps lower the melting point of the alloy.
  • forming in this case silicon-free alloys are preferably used
  • welding in this case indium should be preferably added
  • the expert in the art thanks to his/her general knowledge of the matter, changes the percentages of the auxiliary components.
  • the low carat rating of gold, platinum and palladium, respectively makes it possible to produce alloys that imitate the colours of the respective precious metals or their alloys while at the same time showing a high degree of brightness.
  • the alloy is very elastic, easy to clean, polish and machine and has good lapping values, partly better than those of other alloys with higher carat rating.
  • the alloy does not contain iridium, germanium, silicon, osmium, tin, indium and gallium as elements that make up the alloy.
  • the alloy in any case, can contain these elements within the group consisting of traces of other elements.
  • compositions that in the search for economic alloys with low precious metal carat rating have proved to be particularly suited to be used to make trinkets, because they do not oxidize easily, are easy to machine and shiny, and imitate the shades of alloys with high carat rating.
  • a much preferred variant embodiment of the invention concerns an alloy comprising 4.17% by weight of a metal or a combination of metals selected among a) platinum, b) palladium, and c) platinum and palladium.
  • Preferred quantities of gold are 0.2% by weight - 3.5% by weight.
  • silver is present in quantities included between 8 and 10% by weight and zinc is present in quantities included between 15 and 19% by weight. Even more preferably, the quantity of silver corresponds to 8.8-9.2% by weight, the quantity of zinc to 16.8-17.2% by weight and the quantity of copper to 69.8-70.2% by weight.
  • a further preferred embodiment of the alloy according to the invention is constituted by an alloy comprising 4.17% by weight of a combination of gold, palladium and platinum, in which the three metals are present in equal quantities expressed in weight percentages.
  • the alloy comprises 4.17% by weight of a combination of gold and palladium or of a combination of gold and platinum, in which the two metals are present in equal quantities expressed in weight percentages.
  • a very advantageous variant embodiment of the invention concerns an alloy comprising 0.5% gold by weight and preferably at least 0.1% platinum by weight. Such an alloy is extraordinarily bright.
  • the alloy is consisting of 0.5% gold by weight; 12.5% silver and palladium by weight; 17% zinc by weight and 70% copper by weight wherein there is 0.1% platinum by weight which correspondingly partially replaces silver, palladium, zinc and/or copper, in accordance with the scope of the invention.
  • the invention furthermore concerns a jewel, produced from an alloy according to the invention.
  • Other possible items are, for example, coins, tableware, candle holders or other items of art handicraft.
  • the alloy according to the invention is suited to be used in the processing cycles that are typical of the jewellery sector.
  • the invention achieves the object to provide an economic alloy with low carat rating of gold, platinum and palladium that, in addition to not oxidizing easily and having good workability, imitates the appearance of gold or its alloys with high carat rating and is considerably bright.
  • the production of the alloy follows the methods known in the art for producing alloys containing gold, silver, brass, etc. which are not described herein for the sake of brevity.
  • Table 1 gold platinum palladium silver zinc copper [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.] Ex. 1 0,5 0 12,5 17 70 Ex. 2 0,5 0,1 0 12,4 17 70 Ex. 3 1,39 1,39 1,39 8,83 17 70 Ex. 4 2,09 2,09 0 8,83 17 70 Ex. 5 2,09 0 2,09 8,83 17 70 Ex. 6 4.17 of which 0.2-3.5 gold 8-10 15-19 rest Ex. 7 4.17 of which 0.5-1.0 gold 8-10 15-19 rest Ex. 8 4.17 of which 1.1-2.5 gold 8-10 15-19 rest Ex. 9 4.17 of which 2.6-3.5 gold 8-10 15-19 rest
  • the palladium and silver content of Ex. 1 is according to the claims of the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Medicinal Preparation (AREA)
  • Saccharide Compounds (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Description

    Technical field of the invention
  • The invention concerns an alloy for the production of jewels, in particular precious jewels or trinkets. The invention concerns jewels, produced with this alloy.
    • State of the art
  • In the market of jewellery and costume jewellery a large number of gold alloys or alloys of other precious metals, like for example platinum, are known and used to make jewels. Gold and platinum are metals that do not oxidize easily but they are very expensive. The weight of gold and platinum is relatively high, which limits the size that can be reasonably obtained for the jewels, in particular in the case of earrings.
  • In order to be able to offer jewels also at reasonable prices, the market of costume jewellery has developed several alloys that are based on copper and zinc, components of brass, and that are less expensive than gold alloys but pose several drawbacks.
  • In order to prevent the oxidation of the alloy and therefore the alteration of its gilded appearance, it is necessary to coat the item, for example with a golden layer, by means of a plating process carried out using galvanising methods.
  • This layer, however, is subject to wear. Owing to the oxidation processes, in most cases the alloys that replace the traditional gold alloys do not maintain their gilded appearance over time and need to be frequently cleaned or plated with alloys having a high gold content. Moreover, often these alloys do not imitate the precious metal and its alloys perfectly in terms of external appearance, that is, in terms of colour and degree of brightness.
  • The US patent application US 2009/0317291 A1 describes alloys for jewels with low gold carat rating comprising silver, copper and zinc as main components in addition to gold. The application explains that the alloys with less than 4 carats in gold can present oxidation problems with consequent fogging of the alloy.
    • Presentation of the invention
  • The object of the present invention is to provide an improved alloy that overcomes the drawbacks listed above. The object of the present invention is mainly to propose an alloy with a low precious metal carat rating that, in addition to not oxidizing easily and having good workability, imitates the aspect and the brightness of precious metals and their alloys.
  • The objects mentioned above and others that are highlighted in greater detail below are achieved by an alloy for the production of jewels according to the claims. It is to be understood that the alloys described herein can always contain other elements, meaning elements that are not listed as components that make up the alloy, in the form of inevitable traces. These traces derive from impurities present in the raw materials or are residues of auxiliary materials used during the production or processing of the alloy. In this case, the remaining percentage needed to reach 100% by weight is constituted by copper and inevitable impurities. Advantageously, the traces are present in total quantities not exceeding 0.2% by weight.
  • The addition of metals such as gallium and/or indium helps lower the melting point of the alloy. In order to affect the fluidity of the molten material and the suitability of the material for precision casting, forming (in this case silicon-free alloys are preferably used) or welding (in this case indium should be preferably added), the expert in the art, thanks to his/her general knowledge of the matter, changes the percentages of the auxiliary components. The variation in the content of copper compared to metals with a silvery colouring, like for example zinc, silver and palladium, makes it possible to obtain different colours of the alloy, varying from red or rose through gold yellow until obtaining hues that correspond to those known for white gold.
  • Surprisingly, the low carat rating of gold, platinum and palladium, respectively, makes it possible to produce alloys that imitate the colours of the respective precious metals or their alloys while at the same time showing a high degree of brightness.
  • Moreover, the alloy is very elastic, easy to clean, polish and machine and has good lapping values, partly better than those of other alloys with higher carat rating.
  • According to an advantageous embodiment of the invention, the alloy does not contain iridium, germanium, silicon, osmium, tin, indium and gallium as elements that make up the alloy. As explained above, the alloy, in any case, can contain these elements within the group consisting of traces of other elements.
  • The variant embodiments described below are the compositions that in the search for economic alloys with low precious metal carat rating have proved to be particularly suited to be used to make trinkets, because they do not oxidize easily, are easy to machine and shiny, and imitate the shades of alloys with high carat rating.
  • A much preferred variant embodiment of the invention concerns an alloy comprising 4.17% by weight of a metal or a combination of metals selected among a) platinum, b) palladium, and c) platinum and palladium.
  • Preferred quantities of gold are 0.2% by weight - 3.5% by weight.
  • Other preferred ranges in the alloy are 0.5-1% gold by weight; 1.1-2.5% gold by weight or 2.6-3.5% gold by weight.
  • Preferably, in an alloy according to the invention iridium, germanium, silicon, osmium, tin, indium and gallium are not present, silver is present in quantities included between 8 and 10% by weight and zinc is present in quantities included between 15 and 19% by weight. Even more preferably, the quantity of silver corresponds to 8.8-9.2% by weight, the quantity of zinc to 16.8-17.2% by weight and the quantity of copper to 69.8-70.2% by weight.
  • A further preferred embodiment of the alloy according to the invention is constituted by an alloy comprising 4.17% by weight of a combination of gold, palladium and platinum, in which the three metals are present in equal quantities expressed in weight percentages.
  • In another preferred variant embodiment of the alloy according to the invention the alloy comprises 4.17% by weight of a combination of gold and palladium or of a combination of gold and platinum, in which the two metals are present in equal quantities expressed in weight percentages.
  • For the variant embodiments containing 4.17% by weight of the precious metals gold, platinum and/or palladium, the following is the preferred composition of the remaining 95.83% by weight: iridium, germanium, silicon, osmium, tin, indium and gallium are not present, silver is present in quantities included between 8 and 10% by weight, zinc is present in quantities included between 15 and 19% by weight, and the remaining percentage needed to reach 100% is constituted by copper. Even more preferably, the quantity of silver corresponds to 8.8-9.2% by weight and the quantity of zinc to 16.8-17.2% by weight.
  • A very advantageous variant embodiment of the invention concerns an alloy comprising 0.5% gold by weight and preferably at least 0.1% platinum by weight. Such an alloy is extraordinarily bright.
  • In a preferred variant embodiment, the alloy is consisting of 0.5% gold by weight; 12.5% silver and palladium by weight; 17% zinc by weight and 70% copper by weight wherein there is 0.1% platinum by weight which correspondingly partially replaces silver, palladium, zinc and/or copper, in accordance with the scope of the invention. The invention furthermore concerns a jewel, produced from an alloy according to the invention. Other possible items are, for example, coins, tableware, candle holders or other items of art handicraft.
  • It should be understood that the indicated values (their percentages by weight) always include also values that can be considered equivalent from the point of view of weighing accuracy and analysis of the individual components.
  • The alloy according to the invention is suited to be used in the processing cycles that are typical of the jewellery sector.
  • The invention achieves the object to provide an economic alloy with low carat rating of gold, platinum and palladium that, in addition to not oxidizing easily and having good workability, imitates the appearance of gold or its alloys with high carat rating and is considerably bright.
  • Further variant embodiments of the invention are described in the dependent claims. In the production stage, the alloy and the items manufactured therewith that are the subjects of the invention can be subjected to further modifications or construction variants that are not described herein. Said modifications or variants must all be considered protected by the present patent, provided that they fall within the scope of the claims expressed below.
    • Description of preferred embodiments of the invention
  • The production of the alloy follows the methods known in the art for producing alloys containing gold, silver, brass, etc. which are not described herein for the sake of brevity.
  • The following table 1 lists some examples of embodiment of alloys according to the invention: Table 1
    gold platinum palladium silver zinc copper
    [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.] [% by wt.]
    Ex. 1 0,5 0 12,5 17 70
    Ex. 2 0,5 0,1 0 12,4 17 70
    Ex. 3 1,39 1,39 1,39 8,83 17 70
    Ex. 4 2,09 2,09 0 8,83 17 70
    Ex. 5 2,09 0 2,09 8,83 17 70
    Ex. 6 4.17 of which 0.2-3.5 gold 8-10 15-19 rest
    Ex. 7 4.17 of which 0.5-1.0 gold 8-10 15-19 rest
    Ex. 8 4.17 of which 1.1-2.5 gold 8-10 15-19 rest
    Ex. 9 4.17 of which 2.6-3.5 gold 8-10 15-19 rest
    The palladium and silver content of Ex. 1 is according to the claims of the invention.
  • Possible inevitable traces of other elements have not been indicated.

Claims (10)

  1. Alloy for the production of jewels, consisting of: 7-16% silver by weight; 15-36% zinc by weight; 4.17% by weight of a combination of metals selected among a) gold and platinum, b) gold and palladium, and c) gold, platinum and palladium; 0-0.5% by weight of one or more metals selected among iridium, germanium, silicon, osmium, tin, indium and gallium; the rest being constituted by copper and inevitable impurities, wherein the alloy comprises from 0.2% to 3.5% gold by weight, preferably 0.5-1 % gold by weight or 1.1-2.5% gold by weight or 2.6-3.5% gold by weight.
  2. Alloy for the production of jewels, consisting of: 7-16% silver by weight; 15-36% zinc by weight; 0.1-4.17% by weight of a metal or a combination of metals selected among a) platinum, b) palladium, and c) platinum and palladium; 0-0.5% by weight of one or more metals selected among iridium, germanium, silicon, osmium, tin, indium and gallium; the rest being constituted by copper and inevitable impurities.
  3. Alloy according to claim 2, characterized in that it comprises 4.17% by weight of a metal or a combination of metals selected among a) platinum, b) palladium, and c) platinum and palladium.
  4. Alloy according to claim 1 or 3, characterized in that iridium, germanium, silicon, osmium, tin, indium and gallium are not present therein, and silver is present in quantities included between 8 and 10% by weight, and in that zinc is present in quantities included between 15 and 19% by weight.
  5. Alloy according to any of the claims 1 or 4, characterized in that it comprises 4.17% by weight of a combination of gold, palladium and platinum, in which the three metals are present in equal quantities expressed as weight percentages.
  6. Alloy according to any of the claims 1 or 4, characterized in that it comprises 4.17% by weight of a combination of gold and palladium or a combination of gold and platinum, in which the two metals are present in equal quantities expressed as weight percentages.
  7. Alloy for the production of jewels, consisting of: 7-16% silver by weight; 15-36% zinc by weight; up to 4.17% by weight of a metal or a combination of metals selected among a) gold and platinum, b) gold and palladium, and c) gold, platinum and palladium; 0-0.5% by weight of one or more metals selected among iridium, germanium, silicon, osmium, tin, indium and gallium; the rest being constituted by copper and inevitable impurities wherein the alloy comprises 0.5% gold by weight and preferably at least 0.1 % platinum by weight.
  8. Alloy according to claim 7, characterized in that it is consisting of 0.5% gold by weight; 12.5% silver and palladium by weight; 17% zinc by weight and 70% copper by weight, in which there is 0.1% platinum by weight that correspondingly partially replaces silver, palladium, zinc and/or copper.
  9. Alloy according to anyone of the claims 1, 3 or 5-8, characterized in that the 0-0.5% by weight of one or more metals are selected among iridium, germanium, silicon and gallium.
  10. Jewel produced from an alloy according to any of the preceding claims.
EP13824341.5A 2012-12-17 2013-12-16 Alloy for the production of jewels Active EP2931929B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13824341T PL2931929T3 (en) 2012-12-17 2013-12-16 Alloy for the production of jewels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000335A ITVI20120335A1 (en) 2012-12-17 2012-12-17 LEAGUE FOR THE PRODUCTION OF JEWELRY
PCT/IB2013/002810 WO2014096938A1 (en) 2012-12-17 2013-12-16 Alloy for the production of jewels

Publications (2)

Publication Number Publication Date
EP2931929A1 EP2931929A1 (en) 2015-10-21
EP2931929B1 true EP2931929B1 (en) 2017-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13824341.5A Active EP2931929B1 (en) 2012-12-17 2013-12-16 Alloy for the production of jewels

Country Status (5)

Country Link
EP (1) EP2931929B1 (en)
ES (1) ES2640020T3 (en)
IT (1) ITVI20120335A1 (en)
PL (1) PL2931929T3 (en)
WO (1) WO2014096938A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2041974B (en) * 1979-01-18 1983-03-09 Murao Shoten Gold alloy
JPS55125246A (en) * 1979-03-19 1980-09-26 Murao Shoten:Kk Quaternary gold alloy
JPS5695491A (en) * 1979-12-28 1981-08-01 Masatoshi Tsuda Copper-group brazing alloy
DE102005045477A1 (en) * 2005-09-22 2007-03-29 Qvc Handel Gmbh Gold alloy for manufacture of jewelry contains 75 to 91 per cent weight of the elements gold, silver, zinc and copper
US20090317291A1 (en) * 2008-06-20 2009-12-24 Annette Gertge Variable karat gold alloys
US20090317292A1 (en) * 2008-06-20 2009-12-24 Gertge Annette T Variable karat gold alloys
KR20120080810A (en) * 2011-01-10 2012-07-18 이용화 Alloy composite for low purity gold and low purity gold using the same
KR20120081724A (en) * 2011-01-12 2012-07-20 이용화 Alloy composite for low purity gold and low purity gold using the same
KR20120083184A (en) * 2011-01-17 2012-07-25 이용화 Alloy composite for low purity white gold and low purity white gold using the same
KR20120085127A (en) * 2011-01-21 2012-07-31 이한동 Alloy composite for low purity gold and low purity gold using the same

Also Published As

Publication number Publication date
EP2931929A1 (en) 2015-10-21
ES2640020T3 (en) 2017-10-31
WO2014096938A1 (en) 2014-06-26
ITVI20120335A1 (en) 2014-06-18
PL2931929T3 (en) 2017-11-30

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