GIA is commonly perceived as an independent authority standing apart from diamond miners. Its own historical records, however, reveal an unusually long and extensive relationship with De Beers—stretching almost to GIA's founding.
By approximately 1933, a director of De Beers and Affiliated Mines, H.T. Dickinson, was serving on GIA's Advisory Board. In other words, a De Beers director was advising GIA on its diamond curriculum within roughly two years of GIA's founding.
According to GIA's own historical account, “Beginning in 1940, GIA collaborated with De Beers to create advertising designed to stimulate an interest in diamonds.”
De Beers also supplied diamonds used in GIA's education. It provided GIA's Oppenheimer Student Collection beginning in 1938, donated 1,500 carats of rough diamonds in 1955, and made another major donation of diamond crystals in 1966 to support GIA's teaching of diamond grading and appraisal. GIA today recognizes De Beers among donors that have cumulatively contributed between $500,000 and $999,999 in non-cash gifts.
The relationship extended to marketing. GIA's own history states that, beginning in 1940, “GIA collaborated with De Beers to create advertising designed to stimulate an interest in diamonds.” De Beers' U.S. advertising organization subsequently helped teach American jewelers how to communicate GIA's emerging 4Cs framework to consumers.
The two institutions then jointly addressed the lab grown diamond “threat”. The relationship later became more deeply scientific. A former De Beers Diamond Research Laboratory researcher, D. Vincent Manson, became GIA's Director of Research in 1976 and established GIA's expanded research facility. De Beers later supplied GIA researchers with experimental laboratory-grown diamonds for landmark identification studies. GIA itself has described De Beers as having “worked closely with GIA” on synthetic-diamond research.
The institutional connections continue today. In January 2024, former De Beers CEO François Delage joined GIA's Board of Governors. Delage had been CEO of De Beers Jewellers, 2009–2020 and CEO of De Beers' Forevermark diamond brand.
GIA and De Beers are not institutions whose paths merely happen to cross. Their cooperation spans more than 90 years and has included governance advice, diamond donations, consumer marketing, education, personnel, scientific research, laboratory equipment, provenance infrastructure and, today, a shared corporate investment.