Gemstone, green and brown (from light chocolate to hazelnut brown) common opal, natural, South Africa, 8x8 mm, round beads - Mohs' hardness 5.5-6.0 - one unit is +/- 19 cm and has +/- 23 beads
Gemstone, Dalmatian jasper or Dalmatian stone, Mexico, natural, 8x8 mm, round beads – faceted – Mohs' hardness 6.5-7.0 - one unit is +/- 19 cm and has +/- 23 beads