2. There is no uniform requirement for the serial number of jadeite appraisal certificate. Different jewelry and jade appraisal institutions will have their own serial number system. The name, address, telephone number and website of the appraisal institution are on the appraisal certificate. Consumers only need to open the website of the authentication institution and enter the number of the authentication certificate in the place where the certificate is queried, so they can query the authenticity of the certificate.
3. If you can't find it on the website, there are two situations: (1) The old certificate can't be found online. You can call the evaluation agency. (2) false certificate. There are many such false certificates. It is recommended to go to the local authoritative jewelry appraisal agency for re-inspection to safeguard your rights and interests.
4.CMA is a sign that the measurement certification of testing institutions is qualified, and institutions with this sign are legal testing institutions. According to the relevant provisions of "People's Republic of China (PRC) Product Quality Law", the institutions engaged in social testing and inspection of products in China must be qualified by the national or provincial metrological certification management department in conjunction with the recognized institutions, and can only engage in testing and inspection activities after being established or authorized according to law.
5.CAL is the symbol of the inspection organization recognized by the national quality inspection, and the organization with this symbol is qualified to make arbitration inspection conclusions. Having CMA mainly means that the testing personnel, testing instruments, testing basis and methods are qualified, and the premise of having CAL mark is that the measurement certification is qualified, that is, CMA qualification is obtained, and then the quality management conditions of the organization also meet the requirements.
6.CNAL is the symbol of national laboratory. This mark indicates that the inspection institution has passed the examination of China National Laboratory Accreditation Committee, and its inspection ability has reached the level of national laboratories (CMA and CAL only refer to the approval of provincial quality and technology management institutions). According to the relevant agreements of China's accession to the WTO, "CNAL logo can be recognized internationally, such as the United States, Japan, France, Germany and other countries.