1, the qualification of the testing institution, and the formal quality inspection certificate for jewelry and jade must be a nationally recognized testing institution. The inspection certificate must be printed with any one of cma, cal and cncal.

2. The signature of the inspector (registered) and the issuance of a formal quality inspection certificate for jewelry and jade shall be signed by two people, one of whom must have the signature of China people and the national quality inspector for jewelry and jade (registered), and the registration is within the validity period. Only the signature cannot be stamped (can be printed), so the inspection certificate has legal effect.

3. Inspection certificate. All inspection columns in the inspection certificate must be printed by computer, not by hand.

4. Look at the transparency of the jade bracelet under the lamp, and you can know the authenticity of the jade bracelet according to the transparency.

5, look at the flaws of the jade bracelet, look at the flaws of the jade bracelet, you can see the impurities in the jade bracelet, and the texture with many impurities is not good.

References:

Phoenix Net-Jade Bracelet Identification Method of Jade Bracelet