Inquiry method of gem certificate number

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

2, physical store inquiries, regular gold shops have appraisal departments, when the appraisal shows the quantity and physical objects, there will be professional appraisal, but the appraisal needs to charge related fees.

How to See the Authenticity of Jade Appraisal Certificate

1, depending on the appraisal agency. Because the country has strict qualification requirements for jade quality appraisal institutions, the appraisal certificate issued after certification is valid, so it depends on whether there are CMA, CAL, cncal and other marks on the appraisal certificate. If so, it means that the authentication certificate is credible.

2. Look at the test content. Pay attention to see if the content of the test includes the name, refractive index, color, density and total mass 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 signed by two appraisers, one is the appraiser and the other is the proofreader. In addition, its seal must be a transparent steel seal. If not, then such a jade appraisal certificate is also fake.

Gem quality grade

In order to regulate the market and protect consumers' rights and interests, China has formulated national standards for some jewels and jade with large circulation, including:

GB/T 16554-20 10 diamond classification

Classification of yellow diamonds

GB/T 1878 1-2008 Pearl Classification

Classification of jadeite jade

Classification of rubies (GB/T32863-20 16)

Classification of Sapphire (GB/T32862-20 16)

It can be noted here that "GB" refers to the national standard (GB) and "T" refers to recommendation. In other words, "GB/T" is a national recommended standard, which does not require businesses or institutions to act according to this standard, and it is not illegal for you to adopt other standards.

In fact, apart from the standard of diamond grading, the grading certificates of other gems are relatively rare in the market at this stage. Some "AAAAA" tanzanite and "AAAA" garnet boasted by merchants are based on their own standards or pure nonsense. Please be careful.

As for single crystal gems (diamonds, emeralds, rubies, sapphires, etc. ) are concerned, and the evaluation is nothing more than four aspects: CARATWEIGHT, CLARITY, COLOR and CUT. That is, we often hear "4C". This is a long-standing scientific evaluation system, which is applicable to almost all gems.