2. Look at the English logo. The jade certificate will have the words "CMA", "CAL" and "CNAL". One or more signs represent the qualification of the evaluation institution. "CMA" certification is a third-party testing/calibration laboratory that provides fair data to the society. This logo is a must. "CAL" refers to the marks of testing institutions and quality inspection institutions recognized by the state. "CNAL" is the symbol of the national laboratory, which is also internationally recognized.
3. Look at the license number. Every jadeite appraisal certificate will have a corresponding certificate number. This number is the key to test the authenticity of jadeite. The number on the back of the appraisal certificate should be consistent with the number posted on the back of the object. The appraisal agency will also provide a way to check the authenticity of the serial number. For example, website inquiry, telephone inquiry, SMS inquiry, QR code inquiry, etc.
4. Look at the graphic object, be sure to carefully observe whether the graphic description of the appraisal certificate is consistent with the physical object. See if the shape and color of the jade painting are the same as the real thing. Combined with the data on the certificate, see if there is too much difference between the external weight and density, and whether there is any difference between them. Some merchants will use other certificates with similar shapes in order to sell B and C jadeite. Impersonation is the certificate of these treated jadeites.
5, can judge the authenticity of the jade appraisal certificate. But in fact, the appraisal certificate, as well as some other noteworthy knowledge points, need to be understood by everyone themselves. For example, the jade appraisal certificate will not indicate the origin of the original jade stone. The appraisal certificate must be signed by two appraisers before it is valid. One is an appraiser and the other is an auditor.