The appraisal certificate in China's jewelry market is mainly issued by a third-party notary public with corresponding qualifications. After accepting the entrustment of the enterprise or the consumer, the consigned goods or products are tested and tested according to the corresponding national standards. The certificate examines and proves the main properties, basic state and quality of jewellery.
At present, there are many types of jewellery identification certificates on the market, and some jewellery companies also issue certificates themselves. How do these jewellery identification certificates identify the authenticity?
First, it depends on the date of issue of the certificate of classification. Due to the low toughness of the diamond, it is easy to break. If the certificate was issued very early, it is inevitable that during the period after the certificate is issued, the diamond may be damaged due to various reasons, thus reducing its weight and clarity. Reducing and even cutting will be seriously affected. Therefore, the date of issuance of the diamond identification and grading certificate requires special attention. Second, pay attention to the unit and personnel of the certificate. The identification and grading of diamonds is a highly technical task. It must be carried out by professionally trained and qualified authorities, using all kinds of advanced testing equipment, in a good environment, and the three are lacking. No. At present, there are roughly the following units in China: (1) Relevant institutions of higher learning: such as Peking University, Tongji University, East China University of Science and Technology, Nanjing University, China University of Geosciences, Chongqing University, etc. 2) National quality and technical supervision departments and a few scientific research units engaged in gemological research: such as Beijing National Jewelry Quality Testing Center, Shanghai Quality Supervision Bureau Jewelry Quality Testing Center. (3) Relevant units of the geological and mineral resources department. (4) Relevant scientific research institutes. Therefore, when inspecting the diamond identification and grading certificate, the first is to check whether the certificate is the above-mentioned authority; the second is to check whether the appraiser has the above-mentioned authority qualification certificate.
Second, pay attention to the content of the certificate. Due to different testing units, the format of the certificate may not be the same, but the basic content contained in it is roughly the same. The standard qualification certificate should include the following: the name of the certificate, the shape, weight, clarity, color, cut and other physical parameters of the diamond, a brief review, and a photo, signature of the appraiser (qualification, DGA) , GIA, FGA or HRD), the signature and qualification of the auditor, the name and address of the appraisal unit, the special chapter of the appraisal unit, the date of signing, etc.
Jewelry anti-counterfeiting identification certificate uses anti-counterfeiting inks: fluorescent ink, watermark ink, color changing ink, glare ink, photosensitive ink, OVI ink. Anti-counterfeiting certificates are generally printed in four colors + spot colors or in gravure. The main anti-counterfeiting methods used in the documents are: group flower, lace, embossing, microfilming, invisible watermark anti-counterfeiting, ultra-precision pattern, color fiber anti-counterfeiting, anti-copy group flower, anti-scanning and so on.
The anti-counterfeiting means used in the jewellery identification certificate itself is very important. There is a special pattern. The anti-counterfeiting design of the special technology can make the jewellery identification certificate difficult to be copied. It can help the merchant to prevent the occurrence of counterfeit and shoddy products, to the greatest extent. Protect consumer rights from infringement.
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