The jewelry and jade appraisal certificate issued by it has the pattern of CMA (the symbol of measurement certification by the State Bureau of Quality and Technical Supervision), or cal and cncal, and one of these letters is valid, especially the first symbol CMA, which is the certification symbol required by the state. Consumers buy jewelry appraisal certificates with CMA logo, which largely proves the authority of the appraisal certificates used by merchants and the guarantee of product quality.
1,“CMA”？ Metrological certification and accreditation institutions composed of countries or provinces, and accredited metrological certification units. The basic requirements of national laws for testing and inspection institutions, the institutions with this mark are statutory inspection institutions.
2、“CAL”？ It is the symbol of the inspection organization recognized by the national quality inspection. Institutions with this mark are qualified to make arbitration inspection conclusions. Compared with the mechanism with CMA only, the mechanism with CAL has better quality and reliability.
3、“CNACL”？ According to the relevant agreements of China's accession to the WTO, the "CNAL" logo can be recognized internationally, such as the United States, Japan, France, Germany, Britain and other countries.
Second, the test contents include the name, color, clarity, total mass, density, refractive index and other items of jewelry. These projects are very strict in the national certified jewelry and jade testing institutions.
Third, 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.
Fourth, look at the seal. Strictly speaking, it should be a steel seal, and the font on it can be clearly recognized.
Five, 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.
6. Some certificates can be inquired through websites or short messages. If you are not at ease, you can check them. Enter the number and you will definitely find the style you bought (if it is true).