Not only does China have certificates, but also because diamonds with IGI certificates are generally big suppliers, GIA, which is popular in China, is more common in many small and medium-sized jewelry stores. For diamond certificate, IGI certificate is recommended.

The International Gemological Institute in Antwerp is the oldest gemological institute. 1975 has established laboratories in new york, Bangkok, Mumbai and Tokyo. The IGI Diamond Report is essentially a statement, which verifies the authenticity of diamonds with the help of a world-recognized system and provides reliable and correct diamond identity and grade.

Historical background:

CMA, CAL and CNAS are common in the certificate of jewelry and jade appraisal. According to reports, CMA is a sign that the measurement certification of testing institutions is qualified, and the institutions with this sign are statutory inspection 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.

CAL is the symbol of inspection institutions recognized by national quality inspection, and institutions with this symbol are 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, and then the quality management conditions of the organization also meet the requirements.