The difference lies in the definition standard, gia has the highest fl, followed by IF; Igi is the highest, if everything else is the same.

IGI certificate:

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).

GIA certificate:

193 1 year, Mr. Robert M.Shipley founded the GIA Gemological Institute in the United States, and GIA was the founder who popularized the diamond appraisal certificate to the international level. GIA is a non-profit organization, and its funds are donated by people in the jewelry industry. Its main service scope is jewelry appraisal and professional knowledge education and research, which is deeply recognized by the global jewelry industry. Up to now, GIA has 14 teaching institutions around the world, providing professional courses such as research, sales and appraisal, cultivating high-quality jewelry practitioners, and also contributing to GIA's high reputation in the industry, so that the public's trust and professionalism have always maintained a leading position in the world. Nowadays, the 4C standard proposed by GIA is also a common standard in the international jewelry industry.