First look at 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.
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" is a metrological certification and accreditation institution composed of countries or provinces, and it is an accredited metrological certification unit. The basic requirements of national laws for testing and inspection institutions, the institutions with this mark are statutory inspection institutions.
2. "CAL" is the symbol of testing and inspection institutions recognized by AQSIQ. Institutions with this mark are qualified to make arbitration inspection conclusions. Compared with the mechanism with CMA only, the mechanism with CAL improves the working quality and reliability.
3. The symbol of "CNAL" National Laboratory. According to the relevant agreements of China's accession to the WTO, the symbol of CNAL can be recognized internationally, such as the United States, Japan, France, Germany, Britain and other countries.
Second, look at the test content, including the name, color, purity, 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.
Fifth, look at the quantity. 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).
Jewelry and jade appraisal certificates issued by all domestic jewelry and jade testing institutions:
The contents of the appraisal certificate include identifying the types and imitations of gems, identifying whether the gems are synthesized or not, and identifying whether the gems are optimized, but not evaluating the quality, value and origin of the gems. As far as the appraisal certificate is concerned, it is also related to the type of jade submitted for inspection.
For example, at present, no appraisal institution can issue Tian Huangshi certificate to prove the origin of the certificate. Due to the economic prosperity in recent years, many new jade species have appeared in the market, such as Miyu, taishan jade, Chicken Blood Jade, Xianghuayu, etc ... Some of these jade species have local standards, but there is no national standard. For example, the local standard of Mi language 20 15 was officially released and implemented.
Take Mi language as an example. Mi language is actually mainly composed of quartzite. If a work in Mi language is sent to an appraisal station in Henan Province for appraisal, the name category indicated on the appraisal certificate is Mi language. However, there is no national standard for secret jade, which was identified as quartzite jade in non-Henan appraisal station.