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Cabochon, black onyx (dyed), 15mm calibrated round, B grade, Mohs hardness 6-1/2 to 7. Sold per pkg of 4. - Fire Mountain Gems and Beads
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Black Onyx Stone, Onyx Gemstone, Onyx Cabochon, Black Onyx Wholesale Lot Mix Size for Onyx Pendants Jewelry Supply - Etsy UK
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