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$5,300.00 Clover leaf pattern, Australian semi-black crystal opal. 13.34ct Coober peaky origin Clover leaf pattern, Australian semi-black crystal opal. 13.34ct Coober peaky origin $129.00 Natural Australian Boulder Opal. 8.68ct Untreated, two sided gem. Natural Australian Boulder Opal. 8.68ct Untreated, two sided gem.