Choose Options High Quality Grade A Natural Black Rhyodacite Semi-Precious Gemstone Round Beads - 4mm, 6mm, 8mm, 10mm sizes - 15.5" long As low as £7.99 High Quality Grade A Natural Black Rhyodacite Semi-Precious Gemstone Round Beads One strand approx 15.5" long 4 sizes available: 4mm (98 - 102 beads), 6mm (65 - 68 beads), 8mm (47 - 50 beads), 10mm ( 39 - 42 beads), please choose your preferred size from... As low as £7.99 Choose Options