certificate authority.

This kind is more common. You buy beeswax with a certificate, and the institution of the certificate will write a name that looks tall, such as the appraisal institute of China Jewelry Association and the appraisal center of Beijing Gemstone Association. The certificates issued are also similar, such as steel seal, signature, website, electronic signature, QR code and so on.

Note for certificates:

In fact, such an institution does not have the qualification for inspection at all, and may not even have an office. It only has a "certificate manufacturing machine". Give it a piece of "amber beeswax" and it will issue you a certificate. It is precisely because of the authoritative position of these three appraisal institutions that many people have mastered the technology, grasped the main points, and forged one fake certificate after another, whether it is Peking University, Peking University or national inspection.