Website query, physical store query

How to query the gemstone certificate number

1. Website query, log in to the website corresponding to the appraisal unit marked on the jade certificate; There is a gemstone number on the certificate. Enter the certificate number on the certificate into the corresponding column on the screen, select the query certificate category, and click Query to display the query results;

2. Check in physical stores, regular gold stores have them The appraisal department will provide the serial number and physical object during appraisal, and a professional will appraise it, but relevant fees will be charged during appraisal.

How to check the authenticity of a jade appraisal certificate

1. Check the appraisal institution. Because the state has relatively strict qualification requirements for jade quality appraisal institutions, only appraisal certificates issued after passing the accreditation are valid. Therefore, it depends on whether there are marks such as CMA, CAL, or cnacl on the appraisal certificate. If so, then , which shows that the identification certificate is trustworthy.

2. Look at the test content. Pay attention to whether the test content includes the name, refractive index, color, density, total mass, etc. of the jewelry. These contents are very strict in jewelry appraisal institutions.

3. Look at the signature and seal. The signature of the appraisal certificate must be the signature of two appraisers, one is the appraiser, and the other is the proofreader. In addition, its seal must be a steel seal with clear font. If not, then such a jade appraisal certificate is also fake.

Quality levels of gems and jade

In China, in order to regulate the market and protect consumer rights, national standards have been formulated for some jewelry and jade with large circulation, including:

GB/T16554-2010 Diamond Grading

GB/T34543-2017 Yellow Diamond Grading

GB/T18781-2008 Pearl Grading

GB/T23885 -2009 Jade Grading

GB/T32863-2016 Ruby Grading

GB/T32862-2016 Sapphire Grading

Here you can notice that "GB" means the national standard (national standard Standard), "T" means recommended. In other words, "GB/T" is the national recommended standard. It does not require businesses or institutions to act in accordance with this standard. It is not illegal for you to adopt other standards.

In fact, in addition to diamond grading standards, grading certificates for other gemstones are still relatively rare in the market at this stage. Some of the "AAAAAA" grade tanzanite and "AAAA" grade garnets that merchants brag about are based on the merchant's own standards or are pure nonsense, so please be careful.

As far as single crystal gemstones (diamonds, emeralds, reds, sapphires, etc.) are concerned, the evaluation is nothing more than four aspects: carat weight (CARATWEIGHT), clarity (CLARITY), color (COLOR), Cut (CUT). This is the “4C” we often hear. This is a long-standing and relatively scientific evaluation system that is applicable to almost all gemstones.