A FANCY COLORED DIAMOND RING Of crossover design, bezel-set with three oval-cut colored diamonds and diamonds weighing 1.01, 1.01 and 0.93 carats to the pavé-set diamond surround and shoulders, mounted in platinum With certificate 10943407 dated 06 January 2000 from the Gemological Institute of America stating that the diamond weighing 0.93 carats is fancy orange-yellow, natural color With certificate 10943412 dated 23 February 2000 from the Gemological Institute of America stating that the diamond weighing 1.01 carats is Fancy dark gray-greenish yellow, natural color With additional comments stating that "The color of this stone changes temporarily when heated, or when left in darkness for a period of time and is known in the trade as "Chameleon"
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Chameleon diamonds are one of the great mysteries of the diamond world. It is still not known why these diamonds change from deep green to yellow when heated or left in darkness. Gemmological studies state that the change is due to an unstable color center but they do not explain the exact nature of the centers or why they are sensitive to ultra violet light.