International Gemological Institute (IGI) is a gemological organization which certifies diamond, coloured stone and jewellery. It was established in 1975 in Belgium.[1]
On 21 May 2023, Blackstone Group announced their acquisition of IGI.[2]
History
In March 2007, IGI collaborated with the Tanzanite Foundation to help distribute jewellery certificates using a grading scale called the Tanzanite Quality Scale (TQS), for the gem called Tanzanite, which was discovered in Tanzania in the 1960s.[3][4]
In April 2010, IGI opened a laboratory in Surat, its fifth diamond grading laboratory in India.[5]