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The Diamond Authority of Graff Founded in 1960 by Laurence Graff in London, Graff has become synonymous with some of the rarest and most valuable diamonds ever discovered. Often referred to as the “King of Diamonds,” Laurence Graff built his reputation by sourcing, cutting, and transforming extraordinary stones into breathtaking works of art. Graff controls much of its production process — from rough stone selection to final setting — ensuring unmatched precision and quality