8x8 mm, round, gemstone beads, obsidian, rainbow, natural

Gemstone, black onyx, 8x8 mm, round beads - A-grade, Mohs' hardness 6.0-7.0 - one unit is +/- 19 cm and has +/- 23 beads

Gemstone, pure quartz or rock crystal, 8x8 mm, round beads – A-grade - Mohs' hardness 7.0 - one unit is +/- 19 cm and has +/- 23 beads

Gemstone, natural volcanic or lava rock, waxed and dyed black, 8x8 mm, round beads – Mohs' hardness 3-3.5 - one strand is +/- 19 cm and has +/- 23 beads

Gemstone, bronzite, natural, 8x8 mm, round beads - Mohs' hardness 5.0-6.0 - one unit is +/- 19 cm and has +/- 23 beads