Lazare Kaplan Takes the Wraps Off Mystery Diamond Treatment Lazare Kaplan International and General Electric, the companies behind the new diamond color-enhancing process, have acknowledged for the first time that the treatment involves heat and pressure—an annealing-type procedure many had suspected all along. “The treatment simulates the conditions where the earth forms diamonds and allows the process to finish,” says Bill Woodburn, general manager of GE Superabrasives. The treatment—which has sparked an uproar in the industry (“Mystery Diamond Treatment Dominates GIA Symposium,” JCK, September 1999, p. 92)—elevates brownish and yellowish diamonds to D through G (colorless to near-colorless status). LKI says the process, invented by GE and kept under wraps until now, is permanent, irreversible, and undetectable. In another surprising twist, LKI says it wants to sell

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