Jewelry appraisal certificate as the "identity card" of jewelry is a proof of the authenticity of jewelry. There is a saying that "the insider looks at things, the layman looks at the certificate", and it is difficult for ordinary consumers to practice the eye of professional appraisers, which makes the exclusive identification certificate of jewelry become the reassurance of laymen. As everyone knows, there will be fraud in the jewelry identification certificate. How to judge the authenticity of the jewelry identification certificate? â– flag We can use the mark on the certificate to confirm which special qualifications are approved by the testing institution that issued the certificate. The mark that will appear on the general certificate is: “CMAâ€. “CMA†is the English abbreviation of ChinaMetrologyAccreditation. According to the "Measures Law of the People's Republic of China", the metrological administrative department of the people's government at or above the provincial level shall conduct a comprehensive certification and evaluation of the testing capability and reliability of the testing institutions. This is necessary for any unit that issues a jewelry appraisal certificate. Qualifications. Inspection reports marked with “CMA†can be used for product quality evaluation, results and judicial appraisal, and have legal effect. â– appearance description Confirm that the purchased jewellery is consistent with the sample described in the certificate, including: the photo of the sample, the weight on the label and the weight on the certificate, and whether the appearance and description of the jewelry correspond one-to-one. The photo is a direct evidence that distinguishes different jewels and jade. The photo of the certificate is clear and accurate, which greatly increases the difficulty of forgery. However, in some cases, because the jewellery styles are similar, the photo features are similar and difficult to distinguish. At this point, the exact weight is another valid data that can be verified. In addition to photos and weight, the certificate will also provide some distinctive features such as the color of the jade, the size of the bracelet and so on. â– Detection content The contents of different types of jewelry identification certificates will also differ. As far as the diamond grading certificate is concerned, the most important concern is the color grade and clarity level of the diamond. Some certificates also have the diamond cut ratio; the most important part of the precious metal jewelry purity inspection certificate is the type and content of the precious metal; jewellery and jade The conclusion of the certificate test is the most important. National standards stipulate that natural jewellery and jade are no longer marked with the word "natural", and artificially processed or synthetic gems must be clearly stated, such as: the conclusion is "ruby", indicating that this ruby ​​is pure natural output; "ruby ( "Processing"" indicates the specific treatment method, indicating that this ruby ​​is a natural gemstone, but has been artificially treated in some way to improve its appearance; "synthetic ruby" means non-naturally produced ruby, but pure artificial The laboratory synthetics are gone. “Remarks†column: Samples that encounter some relatively special conditions during the general inspection process will be explained on the remarks. For example, in the identification certificate of Hetian jade, when the surface treatment is involved, the specific treatment method will be indicated in the remarks. â– official seal In order to prevent the certificate of the appraisal agency from being counterfeited, the appraisal certificate must be stamped with the official seal of the unit, and the red official seal as the inspection mark is often not printed with the certificate. It is the seal stamped after the inspection. Nowadays, some large-scale identification machines are more important for anti-counterfeiting. For example, the new version of the certificate issued by the Xinjiang Rock Mine Gemstone Quality Inspection Station in 2007 has also added an online inquiry function. When you query, you need to enter the batch verification code and the enterprise verification code, so that consumers can check it in a convenient way, and check the online information about the jewelry and jade purchased. â– Understanding standards The general identification certificate will also be marked with the standard of jewellery and jade identification. The current national standards include: GB/T16552 jewellery jade name, GB/T16553 jewellery and jade identification, GB/T16554 diamond grading, GB/T18043 precious metal jewellery content non-destructive testing Methods X-ray fluorescence spectrometry, GB11887 jewelry precious metal purity regulations and naming methods. The certificate will clearly indicate which standard the jewellery jade is tested for. In addition, there should be more than two signatures of the appraiser and the date of identification of the certificate.
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