HOW TO TREAT Matrix Opal: STEP BY STEP. (Create Your Own Black Opal Gemstones!)
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I cut the other side of this unpolished gem black opal
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Can you GROW an Opal?
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Getting the Best for Less - Opal Matrix Gemstones!
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Uncut Crystal Gem Opal — or so I thought!
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Glowing rough opal has the potential to cut a top gem
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Making Opals for Free Air Conditioning
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How to Cut a Cabochon Ethiopian Opal Gemstone
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