10x10 mm, round, gemstone beads, tourmaline, black, natural

Gemstone, black tourmaline, natural, 6x6 mm, round beads - Mohs' hardness 7.0-7.5 - one unit is +/- 19 cm and has +/- 32 beads

Gemstone, black tourmaline, natural, 6x8 mm, drop style chips, top-drilled - Mohs' hardness 7.0-7.5 - one strand is +/- 38 cm and has +/- 58 beads

Gemstone, black tourmaline, natural, 8x8 mm, round beads - Mohs' hardness 7.0-7.5 - one unit is +/- 19 cm and has +/- 23 beads

Gemstone, black tourmaline, natural, 8x8 mm, round beads - B-grade - Mohs' hardness 7.0-7.5 - one unit is +/- 19 cm and has +/- 26 beads