2. Usually, English abbreviations often appear on certificates: NGTC (usually called national inspection) and NJQSIC (usually called first inspection). These two are very authoritative appraisal institutions, namely the National Jewelry and Jade Quality Supervision and Inspection Center and the National Jewelry and Jade Quality Supervision and Inspection Center.
3. The national certification mark (i.e. agency qualification) must be printed on the appraisal certificate, and the agency qualification can be divided into five types: CMA, CAL, CNAL, CNAS and ILAC-MRA (representing the certification of different institutions in China respectively, so I won't repeat them here). Among them, CMA mark is the basic requirement of national laws for testing and inspection institutions (institutions with this mark are statutory inspection institutions).
4. Appraisal result: the appraisal conclusion on the certificate is an important basis for judging whether the jade is A goods. If it is A goods, the words "Jade A goods" will be marked; If the goods are B or C, the words "Jade (processed)" and "Jade (injected with glue)" will be marked.
5. Certificate number: Each appraisal certificate has an independent number, and there will also be the contact information and website of the appraisal institution. You can provide the certificate number and check the evaluation results by phone or online. Compare it with the appraisal certificate at hand to judge the credibility.