Extra-extra-long, Rope-length string of Obsidian beads on electric blue thread with electric bllue 3mm glass beads. This necklace is 40 inches long and contains 97 6mm Obsidian beads and 95 3mm glass beads . Obsidian has a glassy luster becaus it is a natural glass formed by rapid cooling of volcanic lava. This strand can be doubles around the neck as shown in the picture. Three obsidian beads in a row is meant to be the back of the necklace. Hand knotted, No clasp; a sinle strand.