Should We Measure EMERALD TREATMENT BY DEGREES? The contentious issue of how to deal with emerald treatment prompted some innovative proposals at the first World Emerald Congress held in Bogota, Colombia, in February. One of the most interesting came from Ron Ringsrud of California’s Constellation Gems, who suggested that trade labs should recognize and identify four levels of treatment – negligible, slight, medium and heavy, depending on the amount of filler used. He said that more than 40% of the emeralds he sees have only a negligible amount of treatment. Other suggestions included asking Merck & Co. Inc. – a U.S. chemical company that produces most of the cedarwood oil used in treating emeralds – to develop a new version of the oil that would be more compatible with jewelry industry needs. The need for a change arises, attendees at the congress learned, because Merc

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