GIA

GIA is a global public benefit institute that ensures the public trust in gems and jewellery through research, education, gemmological laboratory services and instrument development. An independent organization established in 1931 that now operates in 14 countries, GIA created the International Diamond Grading System™ and the 4Cs of diamond quality - Colour, Cut, Clarity and Carat Weight. In 2008, GIA established a gemmological laboratory in Johannesburg and later expanded its gem and jewellery education programmes.

www.gia.edu