It's true. This certificate is issued by Guangdong Jewelry, Jade and Precious Metals Testing Center. Their website is on the back of the certificate. Baidu search this name, the first two are (mine is). If you have a certificate query, you need to enter the experiment number and weight. Those who can find the photos are the same as those on the certificate. I just checked.

In addition, the approver's name is not Wang Feng, but Wang Duo.

For this testing institution, which is abbreviated as GTC Jewelry Testing in China, the testing ability is still very strong. The approver is a doctor, and it is also one of the more than' national registered jewelry appraisers' in China. There are nearly 20 appraisers in this institution, and only 100 people in China. So certificates, photos and other information can be found online, including whether the appraisal result is the same as the certificate in your hand.

Moreover, the standards of GTC in China are very strict, and the national standards are strictly implemented. Similar to the situation that there is too much wax, the color is affected by the residue of polishing powder, and the density can't reach the jade grade, this institution can't issue the certificate of Jade A, and many other institutions, huh ~ don't strictly follow the national standards and don't explain it.