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Your top grade Boulder Opal is BACCCK!

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Your top grade Boulder Opal is BACCCK! 

Boulder opals are easily distinguished by their layer of solid brown ironstone left on the back of the stone. Boulder opals, as the name suggests, are mined from large ironstone boulders under the ground. Thin veins of colourful opal forms in cracks and fissures in these boulders.


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