GIA certificate and national inspection certificate identify access problems

The following URL is the official website of GIA. To query the GIA certificate, you can enter the corresponding certificate number here. GIA is a non-profit organization with funds donated by people in the jewelry industry. Its main service scope is jewelry appraisal and professional knowledge education and research. The following website is the official GIA website. For GIA certificates, you can enter the corresponding certificate number here. .　　　　GIA is a non-profit organization with funds donated by people in the jewelry industry. Its main service scope is jewelry appraisal and professional knowledge education and research. It is deeply recognized by the global jewelry industry. GIA is the founder of the promotion of diamond identification certificates into internationalization. In 1931, Mr. Robert M. Shipley founded GIA Gemological Institute of America (Gemological Institute of America). So far, GIA has 14 teaching institutions around the world, providing professional research and sales. The training of high-quality jewellery practitioners has also contributed to GIA’s lofty reputation in the industry, allowing the public’s trust and professionalism to maintain its leading position in the world. Today’s 4C standards proposed by GIA are also international jewellery Universal standards in the world.　　　　 Domestic NGTC (National Jewelry and Jade Testing Center), the grading standards of authoritative jewelry identification certificates are based on GIA grading standards.　　　　 Regarding the discrepancy between the GIA certificate and the national inspection certificate, each has its own reasons, and consumers are often confused. 1. Cutting problem The GIA agency detects the bare stone. During the inspection, the diamond needs to be placed under an extremely precise instrument and rotated 360 degrees to draw a model of the true scale of the diamond. Use a computer to compare the diamond's'table width ratio' to the pavilion depth ratio 'Wait for various parts to measure and calculate. Each diamond tested by GIA will draw a diamond ratio map in the certificate, so that people can easily see the cut grade of the diamond, and most of the national inspection certificates on the market are for the tested diamonds that have been mounted. The precise measurement of each part of the diamond makes it difficult to make an accurate judgment on the cut of the diamond.　　　　Second, color problem 　　　　 There are many strict requirements for the color grading of diamonds, and only loose stones can correctly compare the colors. When grading loose stones, the table surface of the diamond must be down to compare the most obvious girdle of the diamond, and the table surface of the diamond inlaid is upward, so that the fire color of the diamond itself will largely conceal the color of the diamond, and The color of the inlaid diamond will be affected by the color of the surrounding metal. If the metal color of the inlaid diamond is white, the color of the diamond will appear white, and if the yellow metal is used, the color of the diamond will be yellow against the color. It will affect the judgment of diamonds to a certain extent. 3. Clarity problem The clarity judgment of the diamond after mounting is not accurate, because the clarity of the loose stone is to be inspected on the'crown, pavilion, waist' and other parts, and the diamonds are inlaid During inspection, the clarity of the diamond can only be observed from the “crown” of the diamond. Some can check the “waist”. However, due to the limitation of the style, it is almost impossible to check the clarity of the diamond from the “Pavilion”. The influence of diamonds can not be observed from the table.　　　　 Fourth, weight problem 　　　　 GIA inspection of the weight of the bare stone requires the diamond to be placed in a sealed instrument for weighing, and the weight is accurate to five decimal places. The inlaid diamond cannot be removed and weighed during the weight test. Therefore, when the diamond ring certificate is issued in China, the weight of the'reference mark' mark' mark' mark'stone weight' will be used in the weight. The weight of the diamond printed by the manufacturer on the inner wall of the ring.　　　　 Will the diamond re-inspection level be exactly the same as the GIA certificate?　　　　 Because the grading standards at home and abroad are not exactly the same, the color and clarity grading are completely judged by the individual appraisers against the grading standards. Some grade judgments that are between the edges of the two grades affect the color or clarity grade of the diamond after it is set into a finished product. Some appraisers try to avoid being responsible. It will be automatically downgraded. This is not to say that the diamond is fake, but that different institutions give different results. Note, however, that there will be no big difference in the re-inspection and downgrade of diamonds. For example, in China, the colors of D, E, E, F, and I and J are classified into the same grade. When your diamond is D, E, I color. Generally, there will be no downgrade processing. Only when the color is E color, it may be E-F color. And there are relatively few cases of downgrade processing. When this kind of problem occurs, customers don't have to panic. As long as there is no overstepping and downgrading, the diamond is the diamond corresponding to the GIA certificate. If there is a leapfrog and downgrade, you should pay attention. It may be that you have bought a set of diamonds, such as applying an E-color certificate to an I-color diamond. This is the kind of unscrupulous business that deceives consumers for profit. So babies should pay attention to a few points when buying diamond jewelry. First: Don't blindly trust the seller, WeChat transactions are not credible. There must be a third-party trading platform (such as Taobao, Jingdong), so as to protect the interests of consumers. Second: After receiving the goods, it is recommended to take it for re-inspection first, and then confirm the receipt if there is no problem.　　　　 The above is the author's summary of the GIA certificate information for you. The information comes from the Internet. If there is anything wrong, please understand. If you need a customized diamond setting, please visit the official website of Jewelry Setting. Jewelry Setting will serve you wholeheartedly!