IGI certificate: it belongs to the certificate issued by the International Gemological Institute.

GIA certificate: it belongs to the certificate issued by American Gemological Institute.

Difference 2: the degree of recognition is different.

IGI certificate: Compared with GIA certificate, its credibility is lower.

GIA certificate: Yes, the reliability is higher than that of IGI, because American Gemological Institute has stricter requirements on the quality of masonry.

GIA is an American Gemological Institute, a non-profit organization, which awards 4C diamonds. IGI is an international gem institute; HRD is a high-level meeting of Belgian diamonds; EGL is the European Gemological Institute; These four international diamond certificates can be used all over the world and only identify loose diamonds.

Extended data:

GIA detects bare stones. When testing, it is necessary to rotate the diamond 360 degrees with extremely precise instruments, draw a model of the true proportion of the diamond, and calculate the "table width ratio" and "pavilion depth ratio" of the diamond by computer.

At present, IGI is the largest independent laboratory in the world, with 800 experts in more than ten countries around the world. IGI's patented inventions and technologies include laser lettering, darkroom photos, and international evaluation standards for eight hearts and eight arrows. And pioneered the 3EX cut evaluation system, which is the standard diamond cut evaluation method adopted internationally at present. At present, jewelers in more than 65,438+000 countries have accepted IGI services.

Baidu encyclopedia -igi certificate

Baidu encyclopedia -GIA certificate