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7.71 ct Charming Fancy (21 x 11 mm) Multi Color Australian Koroit Boulder Opal
7.71 ct Charming Fancy Shape (21 x 11 mm) Multi Color Australian Koroit Boulder Opal Natural Loose Gemstone. Boulder Opal. Mohs Hardness: 5.5-6.5 Found in Australia History: Opal is a semi-transparent solidified mineral composed of silicon and water.