Natural Uruguay Amethyst semi-precious gemstone round beads Quantity: one strand approx 15" long for 4mm and 21" long for 5mm and 6mm 3 sizes available: 4mm (89 - 92 beads), 5mm - 5.2mm (99 -102 beads), 6mm - 6.5mm (80 - 84 beads), please choose your preferred size from the selection menu above Beads sizes do vary between different gemstones or even batches for the same gemstone. Please note that there could be a variation of up to 1mm in size Beads hole size reference: 4mm round beads hole size - approx 0.6mm 6mm round beads hole size - approx 0.8mm - 1mm 8mm round beads hole size - approx 1mm 10mm round beads hole size - approx 1mm - 1.2mm