1, look at the sign. On the real jade certificate, the most conspicuous signs are several English abbreviations, and the common signs are "CMA", "CAL" or "CNAL". CMA is a sign that the measurement certification of testing institutions is qualified, and the institutions with this sign are legal testing institutions. CNAL is the symbol of the national laboratory. CAL refers to the standards of inspection institutions recognized by AQSIQ. Among them, "CMA" is necessary. If there is no "CMA" on a certificate, it means that the institution that issued this certificate has no appraisal qualification at all, and such a jade appraisal certificate is a false certificate.

2. Look at the numbers. A valid certificate will have a number on it, which is an important sign to check the authenticity of the certificate. Many false certificates deliberately don't write the number, just to prevent us from finding the authenticity of the certificate after checking the number. A certificate without a serial number is equivalent to a blank sheet of paper.

3. Look at the steel seal. The seal stamped on the jade appraisal certificate must be steel seal, and the handwriting on the steel seal must be legible.

4. Look at the inspector's signature. The formal quality inspection certificate of jewelry and jade should be signed by two people, one of whom must be signed by China people and Chinese jewelry and jade quality inspector (registered). Registration is within the validity period, and only the signature cannot be stamped (can be printed), so the inspection certificate has legal effect.

5. Look at the specific test items. The identification result is the most intuitive, but if you want to know more about the identified jadeite, it depends on the specific jadeite project, such as various physical, chemical and optical characteristics. Every piece of jade must have a certificate of conformity, and the same certificate cannot be used just because it is similar or the same batch of materials.