2. Look at the number: 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 clear and legible.
4. Look at the inspector's signature: If a formal quality inspection certificate of jewelry and jade is issued, two people need to sign it, and one of them must have the signature of China people and the national quality inspector of jewelry and jade (registered), and the registration is within the validity period. Only the signature can not be stamped (can be printed), so the inspection certificate will have legal effect.
5. Look at the specific items and * * * features: the appraisal result is the most intuitive, but if you want to know more about the jadeite, you need to look at the specific jadeite items, such as various physical, chemical and optical features. 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. Everyone should carefully identify and prevent the appearance of Zhang Guan Dai Li.