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Turquoise-Feroza Irani Firoza/Turquoise is a semiprecious gem, composed of hydrous phosphate form of copper and aluminum. The word turquoise is derived from the old French word \\u201cTurkish\\u201d which dates back to 16th century. This gem is known for its unique blue-green color. Firoza Gemstone, Feroza Gemstone.