CN111007047A - Evaluation method for quality grade of blue-amber ornaments - Google Patents
Evaluation method for quality grade of blue-amber ornaments Download PDFInfo
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Abstract
The invention belongs to the technical field of evaluation of quality of blue-amber ornaments, and discloses a method for evaluating quality grade of blue-amber ornaments, which comprises the following steps: (a) collecting blue-amber three-dimensional luminescence spectrum data; (b) calculating color coordinates; (c) CIE-1931 chromaticity diagram notation; (d) establishing a blue-amber light-emitting color standard; (e) establishing a blue-amber luminous relative intensity standard; (f) establishing a blue-amber light-emitting characteristic grading standard; (g) calibrating and comparing samples; (h) evaluation of blue amber quality. The invention provides a unified grading standard, so that the value of the blue-amber has a reasonable evaluation system and evaluation indexes to standardize the market and promote the benign development of the blue-amber industry; the blue-amber grades in sale are clearly distinguished, real and transparent information is provided for consumers, and the consumers can purchase the products as required.
Description
Technical Field
The invention relates to the technical field of evaluation of quality of blue-amber ornaments, in particular to a quality grade evaluation method of blue-amber ornaments.
Background
Blue amber looks like blue sky due to its agile blue optical effect, and is known as "amber king" due to its changing illusion. The blue amber is amber which is seen through the perspective and presents yellow, brownish yellow, yellow green, brownish red and the like, presents unique blue with different hues under the black background of natural light, and can be more obvious under the ultraviolet light. The classification of blue-amber is mainly considered from two aspects of resource supply and market demand. The supply of blue-amber resources is very limited, wherein the dominican republic is the main producing country of the blue-amber, the blue-amber with high quality is produced, the amber produced each year is about 6 kilo and more, the blue-amber accounts for about 10 percent, and the high-quality sky blue only accounts for about 3 percent of the blue-amber; secondly, Mexico, the blue-amber of Mexico is mainly a middle-low grade variety with blue-green light emitting characteristics, but the blue-amber with characteristics such as high blue is not poor; burma also produces a small amount of blues, which accounts for about 5% of burma amber, with tall blues accounting for only about 2%. Therefore, the blue amber is a variety with rare yield, unique color and precious price in the amber.
On the other hand, China is the leading force of the world amber market, and accounts for about 60% of the world amber sales share, and is also the largest consumer of the blue-amber, but the blue-amber sales in the China market have a plurality of problems that ① is confused, the blue-amber with the same quality is named sky blue, named royal blue, and even named blue fairy, namely 32429, which has the self-discovery and no unified cognition, causes the phenomenon of good and unsmooth blue-amber sales, disturbs the healthy consumption of consumers, and obstructs the benign development of the blue-amber industry to a certain extent.
Disclosure of Invention
The invention aims to provide a quality grade evaluation method for a blue-amber ornament, and solves the problem that the blue-amber quality in the existing market has no classification standard, so that the sale is disordered.
In order to achieve the aim, the invention provides the technical scheme that: a quality grade evaluation method for a blue-amber ornament comprises the following steps:
(a) collecting blue-amber three-dimensional luminescence spectrum data: a three-dimensional fluorescence spectrometer is used for obtaining a three-dimensional luminescence spectrum of a blue-amber sample under an XE lamp light source; carrying out weight fitting on relative spectral power distribution under the corresponding wavelengths of the XE lamp and the D65 light source to obtain an approximate three-dimensional luminous spectrum data matrix under the excitation of the D65 light source;
(b) calculating color coordinates: the color coordinates (x, y) of the emission color of the blue-amber sample in a CIE-1931 chromaticity diagram are approximately calculated by adopting a spectrophotometry;
(c) CIE-1931 chromaticity diagram notation: projecting the luminous color coordinates of a plurality of blue amber samples on a CIE-1931 chromaticity diagram to find out the partition of each luminous color category;
(d) establishing a blue-amber luminous color standard: the blue-amber samples are sequentially classified into four major categories of blue, violet-blue, green-blue and blue-green according to the difference of the luminous colors of the blue-amber samples, and corresponding color coordinate reference ranges are marked;
(e) establishing a blue-amber light-emitting relative intensity standard: under the premise of controlling all variables, measuring relative intensity values of the light-emitting characteristics of a plurality of blue-amber samples by using a fluorescence spectrophotometer, dividing the relative intensity values into four grades of very strong, medium and weak according to the intensity of the blue-amber light-emitting characteristics, and marking corresponding relative intensity reference ranges;
(f) establishing a blue-amber light-emitting characteristic grading standard: dividing the blue-amber light-emitting characteristic grading standard into 3A according to the step (d) and the step (e)1、3A2Four levels, 2A, A;
(g) calibrating and comparing samples: according to the step (f), calibrating a set of ball-shaped blue-amber comparison samples with the diameter of 10mm corresponding to the four light-emitting characteristic levels;
(h) evaluation of quality of blue amber: comparing the blue amber to be classified with the comparison sample in the step (g) to determine the luminescent characteristic grade of the blue amber; observing by naked eyes with a 10-time magnifying lens, and dividing the grade of the internal and external features according to the established grading standard of the internal and external features of the blue-amber; the description of the color of the blue-amber is carried out according to the established description standard of the color of the blue-amber.
Further, the method can be used for preparing a novel materialThe three-dimensional fluorescence spectrometer is provided with a 0 DEG to 45 DEG X geometric condition measuring accessory, and the measuring accessory ensures the accuracy of a blue-amber test result by controlling the distance between a sample and an excitation light source, the excited area of the sample, and the distance and the angle between a detector and the sample.
Further, the method can be used for preparing a novel materialAnd (g) hermetically storing the sample at normal temperature (below 25 ℃) in an environment avoiding light irradiation and oxidation, and performing polishing treatment once a year.
Further, the method can be used for preparing a novel materialIn the step (f), when determining the light-emitting characteristic level, the light-emitting characteristic level should be determined in an international standard colorimetric light box without direct sunlight irradiation, the environmental color tone should be neutral gray, the gray level should be N5-N7, and black flannelette without fluorescence and obvious directional reflection is used as an observation background.
Further, the method can be used for preparing a novel materialIn the step (f), when the light-emitting characteristic level is determined, if the light-emitting characteristic level of the blue-spot to be classified is the same as that of a comparison sample, the light-emitting characteristic level of the comparison sample is the light-emitting characteristic level of the blue-spot to be classified; if the light-emitting characteristic level of the blue-amber to be classified is between two adjacent continuous comparison samples, representing the light-emitting characteristic level of the blue-amber to be classified by using the lower light-emitting characteristic level; the blue-amber to be classified is higher than the highest level of the comparison sample, and the highest level is still used for representing the light-emitting characteristic level of the blue-amber to be classified; and if the light emitting characteristic level of the blue amber to be classified is lower than the lowest level of the comparison sample, not classifying.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the invention provides a unified grading standard, so that the value of the blue-amber has a reasonable evaluation system and evaluation indexes to standardize the market and promote the benign development of the blue-amber industry; the blue-amber grades in sale are clearly distinguished, real and transparent information is provided for consumers, and the consumers can purchase the products as required.
(2) The light-emitting characteristic grading standard of the blue-amber is established by representing and quantifying the light-emitting characteristics of the blue-amber, has objective fairness and can effectively reduce the influence of subjective factors of people on the grading standard.
(3) The invention provides a set of influencing factors influencing the quantitative indexes of the luminous characteristics of the blue-amber sample, thereby ensuring the comparability of the blue-amber sample during grading and reducing the influence degree of the quantitative indexes by other factors.
(4) The invention provides a set of test parameters for obtaining the three-dimensional luminous spectrum of the blue-amber sample and a color coordinate value calculation process for the first time, and the comparison and reference are convenient for relevant personnel to calculate.
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FIG. 1 is a flow chart of the evaluation method of the quality grade of the blue-amber ornaments;
FIG. 2 is a 0 °:45 ° x geometry schematic for the observation of blue amber and data acquisition in accordance with the present invention;
fig. 3 is a diagram illustrating the limit of the blue-amber light emission according to the present invention.
Detailed Description
The following is further detailed by the specific embodiments:
amber is mainly an organic macromolecular polymer formed by cross-linking reaction of diterpene molecules. On the basis of human data before analysis, the soluble components of the blue-amber sample are tested by using a gas chromatography-mass spectrometer (GC-MS) in the previous work of the invention. The sample treatment steps mainly comprise: grinding, weighing and bottling; carrying out ultrasonic extraction and Soxhlet extraction, and putting the extracted solution into a water bath kettle for heating; heating in a sand bath to volatilize the solvent; separating by column chromatography, eluting with eluting agent from top to bottom, and separating each fraction of the sample by chromatography column to obtain saturated aromatic hydrocarbon, non-hydrocarbon fraction and insoluble high polymer. When the domino blue amber is extracted to the aromatic hydrocarbon fraction, the solution turns blue, and the light-emitting spectrum before and after extraction changes obviously, which indicates that the light-emitting substance of the domino blue amber is one or more aromatic hydrocarbon compounds.
In view of the above, referring to fig. 1, the present invention provides a method for evaluating quality grade of a blue-amber ornament, comprising the following steps:
(a) collecting blue-amber three-dimensional luminescence spectrum data: a three-dimensional fluorescence spectrometer is used for obtaining a three-dimensional luminescence spectrum of a blue-amber sample under an XE lamp light source; and carrying out weight fitting on the relative spectral power distribution under the corresponding wavelengths of the XE lamp and the D65 light source to obtain an approximate three-dimensional luminous spectrum data matrix under the excitation of the D65 light source.
In particular, the instrument is a three-dimensional fluorescence spectrometer for measuring solids. The instrument was equipped with 0 °:45 ° x geometry measurement accessories, with reference to fig. 2, with the test conditions: the excitation wavelength is 220-500nm, and the emission wavelength is 380-750 nm; factors that influence the test results are controlled to include: the distance between the sample and an excitation light source, the excited area of the sample, the distance between a detector and the sample for testing, the angle and other conditions ensure the comparability of the blue-amber sample during classification. Meanwhile, the maximum luminous relative intensity of the blue-amber sample is within the characterization range of the three-dimensional fluorescence spectrometer, the effective detection amount reaches 80-90%, and the test result is fit with the real luminous characteristic.
It is worth to be noted that the blue-amber light emitting centers are mainly 445nm, 474nm and 508nm, while the relative spectral distribution power curves of the XE lamp in the blue region and the D65 international standard light source are basically overlapped, further indicating that the three-dimensional fluorescence spectrometer is effective and feasible in characterizing the blue-amber light emitting behavior.
(b) Calculating color coordinates: and (3) approximately calculating the color coordinates (x, y) of the emission color of the blue-amber sample in a CIE-1931 chromaticity diagram by adopting a spectrophotometry method.
Specifically, the instrument is provided with a composite light-xenon lamp light source, but the acquired three-dimensional fluorescence spectrum consists of emission spectra under each single-wavelength excitation light source, so that the luminous color of the blue-amber sample is calculated by adopting a spectrophotometry.
The three-dimensional fluorescence spectrometer tests a three-dimensional luminescence spectrum original data matrix (emission wavelength, excitation wavelength and luminescence relative intensity) which is recorded as M and has 511 multiplied by 57 numbers, wherein M is an elementi,jRepresenting the relative intensity value at the emission wavelength i at an excitation wavelength j. In the matrix M, i is the emission wavelength Em, and 511 rows are counted in total by taking integers with the interval of 1nm in the range of 240nm to 750 nm; j is the excitation wavelength Ex, and the total number is 57 columns, taking integers with the interval of 5nm in the range of 220nm-500 nm.
The relative spectral power distribution of the xenon lamp light source of the instrument used in the test is A1＝(j,aj1) Is obtained by an instrument, wherein aj1Representing the relative power of the wavelength j in the spectrum of the xenon lamp light source; the relative spectral power distribution of CIE Standard illuminant D65 is A2＝(j,aj2) From GB/T3978-j2Representing the relative power of wavelength j in the spectrum of CIE standard illuminant D65.
Converting a fluorescence spectrum matrix M under the irradiation of a xenon lamp light source into a fluorescence spectrum matrix N under the irradiation of a CIE standard illuminant D65: element-N of matrix Ni,jPush button
To obtain an element ni,jRepresenting the relative intensity value at the emission wavelength i at the excitation wavelength j. Comprehensively considering the light source wavelength and the emission wavelength range of the sample which can actually excite the luminescence characteristics and the emission wavelength range which can be tested by an instrument and contributes to the luminescence color of the sample, wherein the emission wavelength i used for calculating the color chromaticity coordinates is an integer with the interval of 1nm in the visible light range of 380nm-730 nm; the excitation wavelength j capable of exciting visible light is an integer spaced by 5nm within the range of 300nm-500 nm.
Tristimulus values X, Y and Z were calculated for the samples under CIE 1931 standard colorimetric observer:
in the formula:
λ -wavelength;
SD (λ) — the relative spectral power distribution of CIE standard illuminant D65;
β (λ) — spectral radiance factor obtained by measuring the luminescence characteristics of a sample;
Δ (λ) — wavelength interval;
k is a normalized coefficient of the coefficient,
in detail, in the formula (1), the relative intensity value n of the emission characteristic of each wavelength i in the visible light band measured at different excitation wavelengths j is substituted intoi,jEmission relative spectral distribution at emission wavelength i r (i):
the tristimulus value of the luminescent color of the sample can be obtained
And calculating the color coordinates (x, y) of the CIE 1931 standard chromaticity observer according to the formula (2):
(c) CIE-1931 chromaticity diagram notation: the luminous color coordinates of several blue amber samples are projected on a CIE-1931 chromaticity diagram, and the partition of each luminous color category is found.
(d) Establishing a blue-amber luminous color standard: the blue-amber light emitting device is divided into four categories of blue, violet-blue, green-blue and blue-green in sequence according to the difference of the blue-amber light emitting colors, and corresponding color coordinate reference ranges are marked.
Specifically, referring to fig. 3, the calculated light-emitting color coordinate values are projected on a CIE-1931 chromaticity diagram to find the boundary limits of the light-emitting color categories, so that the blue-amber sample can be sequentially divided into four major categories, namely blue (B), violet-blue (PB), green-blue (GB), and blue-green (BG), according to the difference of the light-emitting colors of the blue-amber sample, wherein the blue (B) can be further divided into B1、B2Two subcategories, and a reference range of color coordinates corresponding to each color is given. Blue (B)1): the luminescent color is pure blue, and the color coordinates (x, y) satisfy: x is the number of<0.148 and y<0.165; blue (B)2): the emission colour is blue with a slight, slightly perceptible shade of purple or greenThe color coordinates (x, y) satisfy: 0.165<y<-2.6x+0.5522(0.130<x<0.157); violet blue (PB): the luminescent color is blue with a easily perceived purple hue, and the color coordinates (x, y) satisfy: -2.6x +0.5522<y<7x-0.938(0.157<x); green-blue (GB): the luminous color is blue with a green tone which is easy to perceive, and the color coordinate (x, y) satisfies: -2.6x +0.5522<y<0.368x +0.186 and 7x-0.938<y(0.130<x<0.170); blue-green (BG): the luminescent color is blue-green, and the color coordinates (x, y) satisfy: y is>0.368x +0.186 and y>7x-0.938(x>0.130)。
(e) Establishing a blue-amber light-emitting relative intensity standard: under the premise of controlling all variables, a fluorescence spectrophotometer is used for measuring the relative intensity values of the light-emitting characteristics of a plurality of blue-amber samples, the blue-amber samples are divided into four grades of strong, medium and weak according to the intensity of the blue-amber light-emitting characteristics, and corresponding relative intensity reference ranges are marked.
Specifically, because the absolute intensity measurement of the fluorescence sample is complex and has a plurality of variables, the invention adopts the relative intensity to represent the difference of the luminous intensity of the sample. The used fluorescence spectrophotometer is provided with a self-zeroing correction process, all parameter condition variables (except a sample) are controlled to be unchanged during actual test, the same sample is tested at different times, and repeatability and accuracy of acquired data are verified. And when the luminous intensity of the samples is compared, taking the maximum value element of the test matrix M as a luminous relative intensity reference value A of the blue-amber sample. The blue-amber light emission is divided into four levels of Very Strong (VS), strong (S), medium (M) and weak (W) according to the relative intensity of blue-amber light emission. When the irradiated surface of the sample emits extremely bright light, A is more than or equal to 6000, and the grade is Very Strong (VS); when the irradiated surface of the sample emits bright light, A is more than or equal to 3000 and less than 6000, and the grade is strong (S); when the irradiated surface of the sample emits brighter light, A is more than or equal to 1500 and less than 3000, and the grade is medium (M); when the light emission of the irradiated surface of the sample is weak, A is more than or equal to 1000 and less than 1500, and the grade is weak (W).
(f) Establishing a blue-amber light-emitting characteristic grading standard: dividing the blue-amber light-emitting characteristic grading standard into 3A according to the step (d) and the step (e)1、3A22A, A.
In particular, according to the established blue-amber emissionThe light color standard and the blue-amber light emission relative intensity standard are divided into 3A1、3A22A, A. When the luminescent color is pure blue (B)1) And a relative intensity level not lower than Very Strong (VS), defining a luminescent feature level of 3A1Trade name "sky blue"; when the luminescent color is slightly, slightly perceptibly violet or green toned blue (B)2) And when the relative intensity level is not lower than the intensity (S), the luminous characteristic level is defined as 3A2Trade name "high blue"; when the emission color is violet blue or green blue (PB or GB) and the relative intensity level is not lower than medium (M), the emission characteristic level is defined as 2A; when the emission color is blue-green (BG) and the relative intensity level is not lower than weak (W), the emission characteristic level is defined as a. Wherein the lighting characteristic level is represented by the lowest level among lighting colors and lighting relative intensities. When the distribution of the blue-amber emission characteristics is uneven, the classification can be still involved if the host emission is blue, but the classification level is not higher than 2A. The light emission characteristic level is defined as 3A1And 3A2And (d) judging that the internal and external feature level cannot be lower than the extremely pure level (C1), and judging the internal and external feature level standard in step (h).
When the light-emitting characteristic level is determined, if the light-emitting characteristic level of the blue-amber to be classified is the same as that of a comparison sample, the light-emitting characteristic level of the comparison sample is the light-emitting characteristic level of the blue-amber to be classified; if the light-emitting characteristic level of the blue-amber to be classified is between two adjacent continuous comparison samples, representing the light-emitting characteristic level of the blue-amber to be classified by using the lower light-emitting characteristic level; the blue-amber to be classified is higher than the highest level of the comparison sample, and the highest level is still used for representing the light-emitting characteristic level of the blue-amber to be classified; and if the light emitting characteristic level of the blue amber to be classified is lower than the lowest level of the comparison sample, not classifying.
(g) Calibrating and comparing samples: according to step (f), calibrating a set of 10mm diameter bead-type blue-amber comparison samples corresponding to the four luminescent feature levels.
Specifically, the blue-amber ratio is stored in a sealed manner in an environment which is lower than normal temperature (25 ℃) and avoids light irradiation and oxidation, and the polishing treatment is performed once a year.
(h) Evaluation of quality of blue amber: comparing the blue amber to be classified with the comparison sample in the step (g) to determine the luminescent characteristic grade of the blue amber; observing by naked eyes with a 10-time magnifying lens, and dividing the grade of the internal and external features according to the established grading standard of the internal and external features of the blue-amber; according to the established description standard of the blue amber self color, the description of the self color is carried out.
When the light-emitting characteristic level is determined, the method is carried out in an international standard colorimetric lamp box without direct sunlight irradiation, the color temperature of a light source is 6500-7500K, the color rendering index is not lower than 90, the distance between the light source and a blue-amber sample to be graded is 15cm, the environmental color tone is neutral gray, the gray level is N5-N7, the geometric condition of 0 degree to 45 degrees x is shown in figure 2, and black lint without fluorescence and without obvious directional reflection is used as an observation background.
Specifically, the classification criteria of the internal and external features are specifically: the blue spots were rated four times according to the difference in appearance effect of the internal and external features of blue spots, observed with the naked eye with 10 times magnification. The internal and external feature levels are represented by extreme purity (C1), purity (C2), purer purity (C3), and general (C4) from high to low, in that order. The blue-amber internal and external characteristics are not seen by naked eyes, a small amount of point objects and slight external characteristics are only arranged at an unobtrusive position in the observation of a 10-time magnifier, and when the appearance is hardly influenced, the grade of the internal and external characteristics is extremely pure (C1) under the trade name of 'pure water'; the internal and external features of the blue amber are difficult to see by naked eyes, a small amount of internal features or external features can be observed by a magnifying glass of 10 times, and when the external appearance is slightly influenced, the internal and external features are in a pure grade (C2); the internal and external features of the blue amber can be seen by naked eyes, and when the external appearance is influenced to a certain extent, the internal and external features are relatively pure in grade (C3); the internal and external features of the blue amber are easily seen by naked eyes, and when the external appearance is obviously influenced, the internal and external features are in the normal grade (C4). The description standard of the color of the blue amber is specifically as follows: the blue-amber sample is described according to the difference of the color of the blue-amber sample, white paper (plate) without fluorescence and obvious directional reflection is used as an observation background of the color description of the blue-amber sample, and a light source is 15cm away from the blue-amber sample to be graded. When the blue amber sample was observed to be yellow in dominant hue, and lighter in color, it was described as light yellow; when the blue amber sample is observed to have a yellow dominant hue and a pure color, the blue amber sample is described as yellow; when the blue amber sample is observed to have yellow dominant hue with other hues such as red, the blue amber sample is described as brown yellow; when the blue amber sample was observed to be not yellow in dominant hue, it was described as otherwise.
The above description is only an embodiment of the present invention, and the common general knowledge of the known specific structures and characteristics in the scheme is not described too much, it should be noted that, for those skilled in the art, it can make several variations and modifications without departing from the structure of the present invention, and these should be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. The quality grade evaluation method of the blue-amber ornaments is characterized by comprising the following steps of:
(a) collecting blue-amber three-dimensional luminescence spectrum data: a three-dimensional fluorescence spectrometer is used for obtaining a three-dimensional luminescence spectrum of a blue-amber sample under an XE lamp light source; carrying out weight fitting on relative spectral power distribution under the corresponding wavelengths of the XE lamp and the D65 light source to obtain an approximate three-dimensional luminous spectrum data matrix under the excitation of the D65 light source;
(b) calculating color coordinates: the color coordinates (x, y) of the emission color of the blue-amber sample in a CIE-1931 chromaticity diagram are approximately calculated by adopting a spectrophotometry;
(c) CIE-1931 chromaticity diagram notation: projecting the luminous color coordinates of a plurality of blue amber samples on a CIE-1931 chromaticity diagram to find out the partition of each luminous color category;
(d) establishing a blue-amber luminous color standard: the blue-amber samples are sequentially classified into four major categories of blue, violet-blue, green-blue and blue-green according to the difference of the luminous colors of the blue-amber samples, and corresponding color coordinate reference ranges are marked;
(e) establishing a blue-amber light-emitting relative intensity standard: under the premise of controlling all variables, measuring relative intensity values of the light-emitting characteristics of a plurality of blue-amber samples by using a fluorescence spectrophotometer, dividing the relative intensity values into four grades of very strong, medium and weak according to the intensity of the blue-amber light-emitting characteristics, and marking corresponding relative intensity reference ranges;
(f) establishing a blue-amber light-emitting characteristic grading standard: dividing the blue-amber light-emitting characteristic grading standard into 3A according to the step (d) and the step (e)1、3A2Four levels, 2A, A;
(g) calibrating and comparing samples: according to the step (f), calibrating a set of ball-shaped blue-amber comparison samples with the diameter of 10mm corresponding to the four light-emitting characteristic levels;
(h) evaluation of quality of blue amber: comparing the blue amber to be classified with the comparison sample in the step (g) to determine the luminescent characteristic grade of the blue amber; observing by naked eyes with a 10-time magnifying lens, and dividing the grade of the internal and external features according to the established grading standard of the internal and external features of the blue-amber; the description of the color of the blue-amber is carried out according to the established description standard of the color of the blue-amber.
2. The method for evaluating the quality grade of the blue-amber ornaments according to claim 1, is characterized in that: in the step (a), the three-dimensional fluorescence spectrometer is provided with a 0 DEG to 45 DEG X geometric condition measuring accessory, and the accuracy of the blue-amber test result is ensured by controlling the distance between the sample and an excitation light source, the excited area of the sample, and the distance and the angle between a detector and the sample to be tested.
3. The method for evaluating the quality grade of the blue-amber ornaments according to claim 1, is characterized in that: in the step (g), the sample is stored in a sealed environment at normal temperature (25 ℃) or below without light irradiation and oxidation, and is subjected to polishing treatment once a year.
4. The method for evaluating the quality grade of a blue-amber ornaments, according to claim 1, characterized in that in the step (f), the light-emitting characteristic grade is determined in an international standard colorimetric lamp box without direct sunlight irradiation, the environmental color tone is neutral gray, the gray level is N5-N7, and black flannelette without fluorescence and obvious directional reflection is used as an observation background.
5. The method for evaluating the quality grade of the blue-amber ornaments according to claim 1, wherein in the step (f), when the light-emitting characteristic grade is determined, if the light-emitting characteristic grade of the blue-amber ornaments to be graded is the same as that of a comparison sample, the light-emitting characteristic grade of the comparison sample is the light-emitting characteristic grade of the blue-amber ornaments to be graded; if the light-emitting characteristic level of the blue-amber to be classified is between two adjacent continuous comparison samples, representing the light-emitting characteristic level of the blue-amber to be classified by using the lower light-emitting characteristic level; the blue-amber to be classified is higher than the highest level of the comparison sample, and the highest level is still used for representing the light-emitting characteristic level of the blue-amber to be classified; and if the light emitting characteristic level of the blue amber to be classified is lower than the lowest level of the comparison sample, not classifying.
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