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In this imitation, thin sheets of metal foil were embedded in glass to produce thin-film interference colors resembling “play-of-color” in natural opal. In 1972, Pierre Gilson began to manufacture a true synthetic opal (Gübelin and Koivula, 2005) that did not require polymer impregnation. Address. TAMIL NADU OPEN UNIVERSITY No 577, Anna Salai Saidapet, Chennai - 600 015. Phone: 044-24306600 Web: