Diamond Notes

GIA Shares Findings On Pegasus Process The Gemological Institute of America’s first published report on General Electric’s color-enhancing diamond treatment reveals that its top scientists can identify some of the stones. They are supposed to be easy to spot: “GE POL” (for General Electric and Pegasus Overseas Ltd., the Lazare Kaplan subsidiary that’s marketing the stones) is inscribed on their girdles. But GIA has received about a dozen stones with the inscription polished off, leading some jewelers to worry that “de-inscribed” diamonds masquerading as natural stones are now in circulation. In an upcoming issue of Gems & Gemology, GIA researchers share their findings from examining 858 GE-POL diamonds between May and July. The stones, ranging from .18 ct. to 6.66 cts., are primarily high-color, high-clarity fancy shapes. Most are type IIa, meaning they have no bo
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