1. Stamp first: the authentic certificates of Hengtai Jewelry are all made of plastic, stamped with steel seal, followed by handwritten signatures: most inspectors and auditors are handwritten signatures.

2. Secondly, the full name, logo, address and sample collection point of the inspection institution: this information will be clearly written on the authenticity certificate. You can refer to the information summary table of appraisal institutions of jewelry association, and the name of the inspection institution should be exactly the same as the published name.

3. Finally, inspection agencies official website, Guan Wei and Tel: After confirming that they are formal appraisal agencies, you can log in to official website and official WeChat to check and verify, or you can call the appraisers of this agency.