The breakthrough research of American Gemological Institute and its own education, experiment and equipment development process are almost the chronicle of the growth of jewelry industry. Since 1953, Richard T. Liddicoat founded and popularized this international diamond grading system, it has become the most respected and authoritative diamond grading appraisal institution in the United States. GIA ensures the credibility of jewelry and diamonds by discovering, imparting and applying gemological knowledge.
IGI
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. Each diamond is analyzed by many experienced appraisers using professional instruments to obtain an accurate description of the quality and characteristics of diamond cutting. Explain the details of diamonds in plain language. IGI Diamond Report usually takes 4C (carat weight, color, clarity and cut) as the analysis structure to record the grade and quality of each diamond.