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How to cut Opal. Can you tell where this Dark Bodied Opal is from?
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Talking Boulder Opal with Broken River Mining @ Kino Gem Show 2022
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Complete Guide to Opal Doublet Making
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Couteau damas fait main à partir d'une vieille lame de scie à ruban
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The Bushmen Find Spectrum Opals Worth $100,000! | Outback Opal Hunters
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Selecting~Sawing and Cutting Boulder Opal
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Learn to cut and polish opal with Saxon
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