Down Under Opals "Dreaming Opals" Boulder opal is a rock that contains thin seams and patches of opal surrounded by or attached to its natural host rock. The cutter studies this rock and decides how to cut the best possible gem. That gem might be cut to display seams and patches of precious opal as they appear within their natural host rock. Stone : Boulder Opal  Mine : Winton Area Outback Queensland Australia Natural Untreated Green/Blue Colour Cut and Polished Solid Stone This beauty is ready to be set in jewellery. We also use a 100mm Macro lens to capture as much detail as possible, sometimes details that are not visible to the common eye. Please note : Not all scales are made the same, so there maybe slight variation is size and weight. FREE COMBINE SHIPPING - (7 DAYS) Member of the " Queensland Boulder Opal Association Inc." Member of the " Lightning Ridge Miners Association" 100% Customer Satisfaction Happy Bidding.