Black obsidian stone is opaque with a glossy polish.
Promotional-quality gemstones (C grade) in bulk package sizes of ten 16-inch strands for an unbeatable value. Ideal for manufacturers and resellers. Colors, shapes and sizes may vary in each lot.
Beads>Grade C>Black ObsidianBeadsGrade CBlack ObsidianBlacksBall4mmNaturalhttp://www.firemountaingems.com/itemdetails/h201143psH201143PSBead, black obsidian (natural), 4mm round, C grade, Mohs hardness 5 to 5-1/2. Sold per pkg of (10) 16-inch strands.//image1.fmgstatic.com/images/p1143psb(2).jpg28.9228.92As Low As $1.48 per strand