At present, there are at least three kinds of appraisal institutions that can issue jewelry appraisal certificates in China: they are determined by the manufacturers themselves; Testing centers such as universities, research institutions and associations; Testing centers authorized by AQSIQ include national, provincial and prefecture-level testing centers.

1. See if the inspection agency is legal. The state has strict qualification requirements for jewelry and jade quality appraisal institutions, and the appraisal certificate issued is only valid if it passes the review. Cma, cal and CNA are common in the certificate of jewelry and jade appraisal.

According to reports, cma is a sign that the measurement certification of testing institutions is qualified, and the institutions with this sign are statutory inspection institutions; Cal is the symbol of inspection institutions recognized by national quality inspection, and institutions with this symbol are qualified to make arbitration inspection conclusions; Cnas is recognized by China National Accreditation Committee for Conformity Assessment, which is formed by the merger and reorganization of former China Certification Body National Accreditation Committee (cnab) and China Laboratory National Accreditation Committee (cnal), and supports international mutual recognition. Any of the above three marks is valid, especially the first mark cma, which is the basic requirement of national laws for testing and inspection institutions.

2. Look at the test content. Including the name, color, purity, total mass, density, refractive index and other items of the goods submitted for inspection, these items are very strict in the nationally certified jewelry and jade testing institutions.

3. Look at the signature of the appraiser. The appraisal certificate must be signed by two appraisers to be valid: one is the appraiser and the other is the reviewer.

4. Look at this seal. Strictly speaking, it should be a steel seal, and the font on it can be clearly recognized.

5. Look at the numbers. There is the serial number of this certificate on the back of the appraisal certificate, which should be consistent with the serial number posted on the back of the physical object. In addition, some certificates have numbers, which can be queried on the website or through SMS. If it is genuine, you can definitely find the style you bought by entering the number.