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Diamond identification blockchain
Publish: 2021-04-22 19:53:09
1. blockchain plus diamond is a landing scenario of Zhongan technology's blockchain application. There are many application cases of Zhongan blockchain technology in anti-counterfeiting traceability, and luxury anti-counterfeiting is also one of the areas involved.
2. Blockchain is made up of structures that cannot be forged. Naturally, it is easier to track the diamond distribution path transparently from beginning to end.
3.
Diamond identification program:
1. GIA diamond identification center
GIA is the most authoritative diamond identification organization in the world, and is now the maker of diamond 4C standard. As a non-profit organization, GIA identification certificate is famous for its impartiality, recognized by people inside and outside the instry, and can be called the proof of diamond identity
generally, diamonds with more than 30 points in China are equipped with GIA diamond certificate, but because the appraisal cost of GIA diamond certificate is relatively high, the price of diamonds with GIA certificate is also higher than that of diamonds with GIA certificate
4. Domestic certificate or foreign certificate, see the diamond certificate mainly see, gram weight, color, cleanliness, cutting, these four face-to-face, and then to see if there is milk coffee, other basic don't see, through these four levels to judge the value of the diamond, personal opinions for reference only, thank you ~
5. The identification center is observed with a microscope and will not damage the diamond. When you bought a diamond ring, you should have an appraisal certificate. Generally, there are diamond jewelry
don't worry, unless you require destructive testing (usually for quality report), otherwise, the identification center will not do any damage to your jewelry. Otherwise, if one is identified and the other is damaged, who is going to identify it
give me points.
don't worry, unless you require destructive testing (usually for quality report), otherwise, the identification center will not do any damage to your jewelry. Otherwise, if one is identified and the other is damaged, who is going to identify it
give me points.
6. 1) Put the diamond on your arm or face. If you feel it's warm, it's a fake diamond. Because the real stone does not transfer heat, no matter how you touch it, it should be cool
(2) if the moisture on the diamond disappears immediately, it is proved to be a real diamond. If the moisture stays on the diamond for a few seconds before it disappears, it is a fake diamond
(3) draw a straight line on a piece of white paper, put the diamond flat on the straight line, observe the straight line through the diamond, if the line at both ends of the diamond edge and the line through the diamond are broken or deformed, it can be concluded that it is a real diamond, if the line is still straight, it is a fake diamond
(4) when the diamond is rubbed back on the fine sandpaper several times, the diamond with scratch on the surface is a fake diamond, and the diamond without scratch is a real diamond
it's unusual to buy diamond jewelry. Complete evaluation of a diamond only depends on the diamond, only depends on the diamond appraisal 4C certificate can provide the most detailed quality situation
the diamond identification certificate should first prove that the measured diamond is true. In other words, the certificate should first ensure that the diamond is a natural diamond, not an imitation or artificial diamond. The first laboratory test is the authenticity of diamonds (such as hardness identification, thermal conctivity test, etc.). In addition, the appraisal certificate also includes the weight, color, cleanliness, cutting ratio, shape, fluorescence, radioactivity and other physical properties of the diamond. All these need to be done with special instruments in the laboratory< In the daily identification, there are some simple and easy methods to identify the authenticity of diamonds:
1. Line test:
wipe the diamond clean and put it on a piece of paper with a line on the table. If the proportion of the diamond is good, the line can not be seen through the diamond, and the vast majority of imitations allow enough light to pass through, at least a part of the line can be seen
2. Drop test:
the ink will leave a line when crossing the diamond surface with a diamond pen. If it is an imitation, the ink will converge into drops
in addition, water drop test can be used. On clean diamonds, the water will stay spherical for a long time, while on imitations, the water will disperse in a relatively short time
these simple methods can help consumers to preliminarily judge the authenticity of diamonds, and the detailed quality needs to be tested and graded by a professional laboratory.
(2) if the moisture on the diamond disappears immediately, it is proved to be a real diamond. If the moisture stays on the diamond for a few seconds before it disappears, it is a fake diamond
(3) draw a straight line on a piece of white paper, put the diamond flat on the straight line, observe the straight line through the diamond, if the line at both ends of the diamond edge and the line through the diamond are broken or deformed, it can be concluded that it is a real diamond, if the line is still straight, it is a fake diamond
(4) when the diamond is rubbed back on the fine sandpaper several times, the diamond with scratch on the surface is a fake diamond, and the diamond without scratch is a real diamond
it's unusual to buy diamond jewelry. Complete evaluation of a diamond only depends on the diamond, only depends on the diamond appraisal 4C certificate can provide the most detailed quality situation
the diamond identification certificate should first prove that the measured diamond is true. In other words, the certificate should first ensure that the diamond is a natural diamond, not an imitation or artificial diamond. The first laboratory test is the authenticity of diamonds (such as hardness identification, thermal conctivity test, etc.). In addition, the appraisal certificate also includes the weight, color, cleanliness, cutting ratio, shape, fluorescence, radioactivity and other physical properties of the diamond. All these need to be done with special instruments in the laboratory< In the daily identification, there are some simple and easy methods to identify the authenticity of diamonds:
1. Line test:
wipe the diamond clean and put it on a piece of paper with a line on the table. If the proportion of the diamond is good, the line can not be seen through the diamond, and the vast majority of imitations allow enough light to pass through, at least a part of the line can be seen
2. Drop test:
the ink will leave a line when crossing the diamond surface with a diamond pen. If it is an imitation, the ink will converge into drops
in addition, water drop test can be used. On clean diamonds, the water will stay spherical for a long time, while on imitations, the water will disperse in a relatively short time
these simple methods can help consumers to preliminarily judge the authenticity of diamonds, and the detailed quality needs to be tested and graded by a professional laboratory.
7. Is it a GIA certificate? If it's a GIA certificate, you can use a magnifying glass to see if the laser code of the diamond waist is consistent with the certificate. If it's not a GIA certificate, please go to the local testing center for re inspection
8.
1. If it is a GIA certificate, it is the most authoritative and reliable. Every GIA Certified Diamond waist has laser code, you can see through the magnifying glass in the light, and the certificate must be consistent
2, if it is a bare diamond, you can draw a line on the white paper, with the table facing down on the line. If it is a diamond, the line can not be seen because of its high refractive index
3, it can be taken to the local identification center for testing
9. You can come and have a look
there are many kinds of diamond identification certificates on the market, and businesses all say that their diamond identification certificates are the most authoritative. In fact, under the interest driven relationship, almost all certificates have "human relationship" in them. The best way is to "give up the near and seek the far", and the second is to look at the three key indicators in the certificate< However, the four major foreign certificates have their own characteristics:
first, GIA of gemstone Institute in the United States has the most rigorous and detailed classification of cutting evaluation. The clarity is also in place. Almost every diamond is engraved with GIA certificate number on its waistline, and the diamond with perfect eight heart and eight arrow effect is engraved with H & a logo on its waistline. GIA is the most authoritative jewelry appraisal institute in the world, which has in-depth research on the color modification and synthesis of diamonds. Diamonds with GIA certificate can ensure that the origin of diamonds is natural and the origin of color is also natural. Notarization is unquestionable, including the diamond identification and grading standards are formulated by GIA. It has a professional diamond identification website around the world, and every diamond after 2000 can be queried online. Diamonds with the same level and cutting GIA certificate are the most expensive. Basically, 95% of them have passed the approval of domestic appraisal institutions
generally speaking, the fairness of domestic diamond identification certificate is not stable enough. There are mainly two tendencies:
one is "too strict". The main domestic certificates are "national jewelry testing center", referred to as "national inspection". For example, a friend with diamonds certified as VS1 and G by GIA turned into VS1 and j color after re inspection, and the more common phenomenon was that G color turned into H or even I color. He used such "strictness" to establish his "authority", which scared away a large number of diamond dealers
the second is that the "certificate of human relationship" has happened. It is mainly manifested in "local protectionism". Many consumers take the diamonds bought by a to B for identification, resulting in many misunderstandings
thirdly, the classification of cutting evaluation is too rough. The main categories are: average, good, very good. The seven major indicators of diamond cutting in foreign certificates are: 1. Table width ratio, 2. Full depth ratio, 3. Crown angle ratio, 4. Crown height ratio, 5. Pavilion depth ratio, 6. Waist thickness ratio, 7. Bottom tip ratio. At the same time, the polishing degree and symmetry ratio of diamond cutting are very detailed. The domestic certificates are too simple. Many testing institutions even use zircon to replace the colorimetric stone, and the error is large
why is cutting so important? When a beam of white light passes through a diamond, if it first reflects through the diamond table, then refracts inside the diamond, and finally refracts completely through the diamond table, then the white light will be decomposed into seven colors, and the colors of the main wavelengths are red, blue and yellow. Therefore, when we see a diamond with good cutting, we can feel the seven colors of light from the diamond, And mainly red, blue, yellow light, rotation can see such as rainbow general light. The completely refracted light makes the diamond feel very crystal clear, radiant and charming
when the diamond table is too small and the pavilion depth is too large (commonly known as "chimney tube"), light will escape from the pavilion at the other end after a refraction, making the diamond appear ll; The diamond table is too large (commonly known as "flying saucer"), the pavilion is too shallow, the light has directly leaked from the diamond Pavilion without refraction, of course, it will not reflect the colorful light
the most ideal cutting is that most of the light comes in from the table and then refracts out of the table through the inside. The most perfect cutting is the perfect reflection without any light leakage. Only the cutting evaluation is "excellent = perfect". You choose the most demanding diamond
if the same one carat rough diamond is processed into the most ideal cutting diamond, it can only be made into 0.25-0.30 carat bare diamond, and the average yield of rough diamond is about 25%; If it is processed into "chimney pipe" or "flying saucer", it can be processed into 0.40-0.50 carat bare diamonds. Therefore, the cutting is perfect and close to harsh diamonds. You will kill the diamond dealers and refuse to sell them to you too cheaply
generally speaking, the appraisal certificate obtained from the local jewelry appraisal organization should be insured. After all, it's scrupulous to issue a certificate of identification locally. Rabbits don't eat grass beside their nests. Although the words are a little ugly, they are the status quo of the jewelry instry. It's hard to say the appraisal certificate issued in other places. If you buy valuable jewelry, it's best to ask the knower to help
I bought Tongling Emerald Diamond, and the appraisal result is on the appraisal certificate. Diamond
Jewelry name ring
total weight 1.8806
cleanliness grade VVS
color grade I-J
bracket fineness pt950 remarks the grade of diamond is very important, so it should be on the appraisal certificate, and the appraisal certificate of each place may be different. My appraisal certificate is from Jiangsu Province
I hope it can help you.
there are many kinds of diamond identification certificates on the market, and businesses all say that their diamond identification certificates are the most authoritative. In fact, under the interest driven relationship, almost all certificates have "human relationship" in them. The best way is to "give up the near and seek the far", and the second is to look at the three key indicators in the certificate< However, the four major foreign certificates have their own characteristics:
first, GIA of gemstone Institute in the United States has the most rigorous and detailed classification of cutting evaluation. The clarity is also in place. Almost every diamond is engraved with GIA certificate number on its waistline, and the diamond with perfect eight heart and eight arrow effect is engraved with H & a logo on its waistline. GIA is the most authoritative jewelry appraisal institute in the world, which has in-depth research on the color modification and synthesis of diamonds. Diamonds with GIA certificate can ensure that the origin of diamonds is natural and the origin of color is also natural. Notarization is unquestionable, including the diamond identification and grading standards are formulated by GIA. It has a professional diamond identification website around the world, and every diamond after 2000 can be queried online. Diamonds with the same level and cutting GIA certificate are the most expensive. Basically, 95% of them have passed the approval of domestic appraisal institutions
generally speaking, the fairness of domestic diamond identification certificate is not stable enough. There are mainly two tendencies:
one is "too strict". The main domestic certificates are "national jewelry testing center", referred to as "national inspection". For example, a friend with diamonds certified as VS1 and G by GIA turned into VS1 and j color after re inspection, and the more common phenomenon was that G color turned into H or even I color. He used such "strictness" to establish his "authority", which scared away a large number of diamond dealers
the second is that the "certificate of human relationship" has happened. It is mainly manifested in "local protectionism". Many consumers take the diamonds bought by a to B for identification, resulting in many misunderstandings
thirdly, the classification of cutting evaluation is too rough. The main categories are: average, good, very good. The seven major indicators of diamond cutting in foreign certificates are: 1. Table width ratio, 2. Full depth ratio, 3. Crown angle ratio, 4. Crown height ratio, 5. Pavilion depth ratio, 6. Waist thickness ratio, 7. Bottom tip ratio. At the same time, the polishing degree and symmetry ratio of diamond cutting are very detailed. The domestic certificates are too simple. Many testing institutions even use zircon to replace the colorimetric stone, and the error is large
why is cutting so important? When a beam of white light passes through a diamond, if it first reflects through the diamond table, then refracts inside the diamond, and finally refracts completely through the diamond table, then the white light will be decomposed into seven colors, and the colors of the main wavelengths are red, blue and yellow. Therefore, when we see a diamond with good cutting, we can feel the seven colors of light from the diamond, And mainly red, blue, yellow light, rotation can see such as rainbow general light. The completely refracted light makes the diamond feel very crystal clear, radiant and charming
when the diamond table is too small and the pavilion depth is too large (commonly known as "chimney tube"), light will escape from the pavilion at the other end after a refraction, making the diamond appear ll; The diamond table is too large (commonly known as "flying saucer"), the pavilion is too shallow, the light has directly leaked from the diamond Pavilion without refraction, of course, it will not reflect the colorful light
the most ideal cutting is that most of the light comes in from the table and then refracts out of the table through the inside. The most perfect cutting is the perfect reflection without any light leakage. Only the cutting evaluation is "excellent = perfect". You choose the most demanding diamond
if the same one carat rough diamond is processed into the most ideal cutting diamond, it can only be made into 0.25-0.30 carat bare diamond, and the average yield of rough diamond is about 25%; If it is processed into "chimney pipe" or "flying saucer", it can be processed into 0.40-0.50 carat bare diamonds. Therefore, the cutting is perfect and close to harsh diamonds. You will kill the diamond dealers and refuse to sell them to you too cheaply
generally speaking, the appraisal certificate obtained from the local jewelry appraisal organization should be insured. After all, it's scrupulous to issue a certificate of identification locally. Rabbits don't eat grass beside their nests. Although the words are a little ugly, they are the status quo of the jewelry instry. It's hard to say the appraisal certificate issued in other places. If you buy valuable jewelry, it's best to ask the knower to help
I bought Tongling Emerald Diamond, and the appraisal result is on the appraisal certificate. Diamond
Jewelry name ring
total weight 1.8806
cleanliness grade VVS
color grade I-J
bracket fineness pt950 remarks the grade of diamond is very important, so it should be on the appraisal certificate, and the appraisal certificate of each place may be different. My appraisal certificate is from Jiangsu Province
I hope it can help you.
10. Date: issue date of GIA certificate GIA report: for different numbers printed on each diamond, it's like a person's ID card. Shape: diamond shape, round shape, pear shape, olive shape, oval shape, heart shape, emerald shape, Princess square shape, ancient French shape... Measurements: the actual size of a diamond, diameter * diameter * height Weight: 1 carat is 100 cents Depth: the ratio of the diamond top to the bottom
Table: the ratio of diamond waist diameter to table diameter
crown height: the proportion of the crown of a diamond (round or irregular) relative to its diameter Pavilion depth: the ratio of diamond (round or irregular) Pavilion to diameter Symmetry: the degree of symmetry of a diamond Girdle thickness: the thickness of a diamond's girdle Cullet: the appearance of the facet of the bottom tip. Generally speaking, the bottom tip of a small diamond is retained. In order to protect the bottom tip from damage, some large diamonds grind off the bottom tip in advance and add one more facet Polish: the polishing level of a diamond. The degree of polish can make the diamond appear brighter, but some diamonds have original crystal surface on the table and can't be polished completely Clarity grade: the clarity grade of a diamond under a 10x magnifying glass Clarity structure diagram: a display image observed under a magnifying glass that describes the shape of a diamond and the characteristics and location of its contents Color grade: the color grading of diamonds Fluorescence: the visible light emitted by a diamond under ultraviolet light Comments: description of other characteristics of diamond not mentioned in the report
4C of diamond: color, clarity, weight, cutting
Color: colorless is the best, the darker the tone, the worse the quality. In the color classification of colorless diamonds, the top color is D, which is arranged from D to Z. here, we only talk about the color level from D to J. D-J is colorless, and g-j is nearly colorless. From K down, there is basically no significance of collecting and wearing. Because from K down, diamonds will graally turn yellow. When we choose diamonds, we try to choose colors above h. Although I-J level is near colorless, we can detect a little yellow. Diamonds with color, such as red, pink, green, blue, etc., belong to the treasures of diamonds and are expensive. Among them, red diamond is the most valuable Color, there is a colorimetric stone contrast identification Oh
carat weight: under the same conditions of the other three CS, the price of a diamond is directly proportional to the square of the weight. The larger the weight, the higher the value. The weight of a diamond is in carats. 1 carat (CT) = 0.2 g (g). One carat is divided into 100 parts averagely, and each part is one point. The 0.3ct and 0.4ct marked on the price tag of the shopping mall are what we call 30 points and 40 points
clarity: the Cleanliness classification is based on the location, size and quantity of the contents. From high to low, the cleanliness level can be divided into FL, if, vvs1, VVS2, vs 1, VS2, SI1, SI2, Si3, P1, P2, P3. The cleanliness of diamonds should be carefully observed under a ten times microscope. The more defects and the more obvious the location, the worse the quality and the lower the price
cut: a diamond's original stone will not be noticed even if it is thrown on the road. It is the cut that gives it a second life and makes it have brilliant fire color. Cut refers to the geometry and arrangement of various petals of the finished bare drill. Cut is divided into three parts: cutting proportion, polishing and decoration. Each item has five levels, from high to low is excellent, very good, good, fair, poor. Top cutting stone, its reflection of light can reach the closest perfect ratio For example, we call the three e x (Excel) cutting, but the price of this kind of cutting will be a little more expensive, because its proction rate is relatively low, it will be about 5% higher than the price of the non three ex cutting, but the fire color of the three ex stone is absolutely the most gorgeous
Table: the ratio of diamond waist diameter to table diameter
crown height: the proportion of the crown of a diamond (round or irregular) relative to its diameter Pavilion depth: the ratio of diamond (round or irregular) Pavilion to diameter Symmetry: the degree of symmetry of a diamond Girdle thickness: the thickness of a diamond's girdle Cullet: the appearance of the facet of the bottom tip. Generally speaking, the bottom tip of a small diamond is retained. In order to protect the bottom tip from damage, some large diamonds grind off the bottom tip in advance and add one more facet Polish: the polishing level of a diamond. The degree of polish can make the diamond appear brighter, but some diamonds have original crystal surface on the table and can't be polished completely Clarity grade: the clarity grade of a diamond under a 10x magnifying glass Clarity structure diagram: a display image observed under a magnifying glass that describes the shape of a diamond and the characteristics and location of its contents Color grade: the color grading of diamonds Fluorescence: the visible light emitted by a diamond under ultraviolet light Comments: description of other characteristics of diamond not mentioned in the report
4C of diamond: color, clarity, weight, cutting
Color: colorless is the best, the darker the tone, the worse the quality. In the color classification of colorless diamonds, the top color is D, which is arranged from D to Z. here, we only talk about the color level from D to J. D-J is colorless, and g-j is nearly colorless. From K down, there is basically no significance of collecting and wearing. Because from K down, diamonds will graally turn yellow. When we choose diamonds, we try to choose colors above h. Although I-J level is near colorless, we can detect a little yellow. Diamonds with color, such as red, pink, green, blue, etc., belong to the treasures of diamonds and are expensive. Among them, red diamond is the most valuable Color, there is a colorimetric stone contrast identification Oh
carat weight: under the same conditions of the other three CS, the price of a diamond is directly proportional to the square of the weight. The larger the weight, the higher the value. The weight of a diamond is in carats. 1 carat (CT) = 0.2 g (g). One carat is divided into 100 parts averagely, and each part is one point. The 0.3ct and 0.4ct marked on the price tag of the shopping mall are what we call 30 points and 40 points
clarity: the Cleanliness classification is based on the location, size and quantity of the contents. From high to low, the cleanliness level can be divided into FL, if, vvs1, VVS2, vs 1, VS2, SI1, SI2, Si3, P1, P2, P3. The cleanliness of diamonds should be carefully observed under a ten times microscope. The more defects and the more obvious the location, the worse the quality and the lower the price
cut: a diamond's original stone will not be noticed even if it is thrown on the road. It is the cut that gives it a second life and makes it have brilliant fire color. Cut refers to the geometry and arrangement of various petals of the finished bare drill. Cut is divided into three parts: cutting proportion, polishing and decoration. Each item has five levels, from high to low is excellent, very good, good, fair, poor. Top cutting stone, its reflection of light can reach the closest perfect ratio For example, we call the three e x (Excel) cutting, but the price of this kind of cutting will be a little more expensive, because its proction rate is relatively low, it will be about 5% higher than the price of the non three ex cutting, but the fire color of the three ex stone is absolutely the most gorgeous
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