Not all the jewels sold in Tik Tok are real, because the merchants selling jewelry will attach a jewelry appraisal certificate, which records the origin, material and expert's appraisal signature of the jewelry, as well as the watermark of the merchant.

This is true if the jewelry sold in Tik Tok meets the above requirements. Only a jewelry appraisal certificate can prove that the jewelry sold in Tik Tok is true, and vice versa.