De Beers, GIA Defend Research De Beers’ announcement of a breakthrough in detecting the Pegasus “whitening” treatment (now being marketed as Bellataire) has run into some prominent naysayers—the people who invented the process. “My guess is that 90% of the stones are still undetectable,” says Thomas Anthony, a scientist at General Electric, which owns the treatment technology. The problem, he says, is that the De Beers method detects stones based on their patterns of nitrogen. But he claims the diamonds that GE now buys—high-color type IIa stones—are nitrogen-free. “Most of the stones De Beers looked at are low colors that we don’t make anymore,” he says. “There’s no question that De Beers can detect them, but that’s no longer where the action is.” The De Beers method was the subject of a paper that appeared in the Spring 2000 issue of Gems & Gemol

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