1. GIA, Gemological Institute of America. Is an independent non-profit organization, as the authority of the world gem industry, known for its impartiality. The college's breakthrough research and its own education, experiment and equipment research and development process are almost the chronicles of the growth of the jewelry industry.

For the identification of diamonds, the classification of cut evaluation is very fine and the most rigorous. The clarity is also in place. Almost every diamond's waistline is engraved with H & AMPA certificate number, and perfect diamonds with eight hearts and eight arrows are engraved with H & ampA sign GIA, which is the most authoritative jewelry appraisal institution in the world and has in-depth research on the discoloration synthesis of diamonds. Diamonds with GIA certificate can ensure that the origin of diamonds is natural and the origin of colors is natural. There is no doubt about notarization, including the standards for diamond identification and classification, which are formulated by GIA. GIA has a professional diamond identification website all over the world, and every diamond after 2000 can be queried online. Diamonds of the same grade and GIA certificate are the most expensive.

2. China Light Industry Jewelry (CLIJ) Gem Appraiser Qualification Certificate-CLIJ Certificate is 1999 1. The State Council Central Organization Committee awarded China National Light Industry Federation the Chinese character [1999], which was approved to be established in June. China's jewelry industry was and is still under the responsibility of light industry, which has a high authority.

Personally, I think GIA is more authoritative. At least internationally recognized.