IGI (International Gemological Institute) is a leading gemological institute founded in 1975. Based in Antwerp, Belgium, it is one of the largest independent institutes globally. Renowned for its grading reports, IGI provides comprehensive descriptions of gemstones and diamonds, along with corresponding certification.

HRD (Hoge Raad voor Diamant): Established in 1973, HRD is a jewelry grading institution based in Antwerp, Belgium. HRD is renowned for its strict diamond grading standards and expertise. Their grading reports offer detailed descriptions of diamonds, including the four Cs grading and other relevant information. HRD's reports are widely recognized and hold high credibility in the global jewelry market.

GRC (Gemological Research Center): Founded in 1982, GRC is headquartered in New York City, USA. GRC is an institution that provides gemstone and jewelry grading services. GRC's reports include comprehensive descriptions of gemstones, quality assessments, and any potential unique characteristics.