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Diamonds represent the vast majority of gems sold worldwide. Colored diamonds are among the most valuable commodities of modern times. This brooch, designed by A. Shinde, contains fine yellow, pink, and colorless diamonds, as well as an 8.00-ct natural-color green diamond as the center stone. A pressing concern in the gem trade is the recent commercial introduction of gem-quality synthetic yellow diamonds manufactured in Russia. The lead article in this issue examines several of these Russian synthetic diamonds and provides criteria by which they can be separated from their natural counterparts. |
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