ON THE ALERT FOR GREEN OPTICON American Gemological Laboratories, New York City, has issued a “Gem Alert” warning the trade about the use of green Opticon to fill surface-reaching fissures in emeralds. While clear Opticon and other synthetic resins have been used for years, the color variation of the product adds a new twist. “The addition of a color-enhanced product will complicate disclosure issues and the stability of the emerald market,” says AGL President C.R. Beesley. “Adding coloring agents to gemstone fillers is certainly not a new concept. But in this case, many have overlooked the obvious potential of color additives in synthetic resin clarity treatments.” Beesley acknowledges he has not seen colored resins in emeralds sent to his lab, but says he has heard they are being used in the market. He says he and his associates are performing tests using green Optico

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