Gemstone, natural volcanic or lava rock, waxed and dyed black, 10x10 mm, round beads – Mohs' hardness 3-3.5 - one unit is +/- 19 cm and has +/- 19 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