Method:
1, depending on the inspection agency. 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.
2. The test contents include the name, color, clarity, total mass, density, refractive index and other items of jewelry, which are in the national certification of jewelry and jade inspection.
These items of testing institutions are very strict.
3. Look at the signature of the appraiser. The appraisal certificate must be signed by two appraisers before it is valid. One is an appraiser and the other is an auditor.
4. Look at that Indian boy. 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.