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$218.00 Large colorful Boulder Opal. Australian untreated specimen. 29.25ct Large colorful Boulder Opal. Australian untreated specimen. 29.25ct $129.00 Natural Australian Boulder Opal. 8.68ct Untreated, two sided gem. Natural Australian Boulder Opal. 8.68ct Untreated, two sided gem. $169.00 Natural Boulder opal. Two sided. Unique color and pattern. Untreated. Natural Boulder opal. Two sided. Unique color and pattern. Untreated.