1. The contact information of the organization must be printed on the certificate. On the back of the certificate, in addition to the qualifications possessed by the organization, there must also be detailed information such as the name, contact number, address, and website of the accredited organization. 2. The qualifications of the organization must be printed on the certificate. There are five certifications: UC, CMA, CNAL, CNAS and ICLAMRA. Among them, the inspection report marked "CMA" can be used for product quality evaluation, results and judicial appraisal, and has legal effect. The logo only indicates that the organization is a unit that has passed the metrological certification review, and is a must-have qualification for any unit that issues a jewelry appraisal certificate. 3. The certificate must have the signature of the inspector. 4. The identification content on the certificate is comprehensive and detailed. 5. The identification items on the certificate must be printed by machine. National appraisal certificates are mandatory to be printed by machine, and manually filled out appraisal certificates have no reference value. If an appraisal certificate contains the above five pieces of information, then the certificate is more authoritative.