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Japanese calls Kuro-Tan-Paku-Seki. Black Opal is a greenish type of opal with black mottling and gold flecks. Usually found in ancient hot springs, the gem is usually tumbled smooth and cut cabochon.
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Japanese calls Kuro-Tan-Paku-Seki. Black Opal is a greenish type of opal with black mottling and gold flecks. Usually found in ancient hot springs, the gem is usually tumbled smooth and cut cabochon.