Onyx Gemstone Matte Finish Round Strand | 8mm | Black | 48 Bead(s)Black Onyx Matte Finish Strand Round Beads for Jewelry Making. These unusual 48 beads of matte finished black onyx eight millimeter will make wonderful necklaces, earrings and pendants. Black Onyx is a form of Chalcedony, which is microcrystalline quartz formed in the gas cavities of lava. Black Onyx hardness ranges from of 6. 5 to 7 on Moh's Scale. It can be worn as jewelry and saved as heirloom qulaity stone for generations without tarnish or
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