First of all, there are many jewelry appraisal institutions in China, mainly including Wuhan Geological University Appraisal Center (national qualification), Guangdong Geological Appraisal Center, Yunnan Jewelry Appraisal Center, China Business Federation Appraisal Center, zhongwei Quality Inspection Appraisal Center and Guangdong Gold and Silver Jewelry Appraisal Center. The specific website can be Baidu.

Secondly, after buying jewelry, the merchant will give you an appraisal certificate, which will have the specific website address, certificate number, check code, weight and other news of the appraisal institution.

Finally, take the jewelry of China Business Federation as an example. After logging in to their website, you can see the certificate number query on the left:

Enter the certificate number and click Query. As shown in the figure: