Gemological Institute (USA) is the founder who popularized the diamond appraisal certificate to internationalization. It was founded by Robert shipley in 193 1 year, and has a history of nearly 70 years. GIA is a non-profit organization, and its funds are donated by people in the jewelry industry, but its appraisal and teaching costs are quite high. GIA's appraisal is quite credible. It is not only the first gemstone institute in the United States, but also one of the widely respected and recognized jewelry and diamond appraisal institutions in the global jewelry industry. GIA-certified diamonds are internationally recognized, and the appraisal fee has been rising steadily! Since 2006, GIA Gemological Institute of the United States has officially launched the online inquiry system of GIA diamond appraisal certificate worldwide. The introduction of the system has played a great role in the inquiry and anti-counterfeiting of identification certificates.

IGI

IGI (International Gemological Institute) was established in Antwerp, Belgium in 1975. Antwerp is the world diamond center. At present, it is the largest independent jewelry appraisal laboratory in the world, with 17 in major diamond trading centers around the world (Antwerp, new york, Toronto, Dubai, Tokyo, Hongkong, Tel Aviv, Los Angeles and Mumbai).

GIC Jewelry Institute, Wuhan Geo University, China Beijing Geo University (same as Wuhan)

At present, domestic authorities study jewelry.