High quality Grade A Natural Fancy Opal Semi-precious Gemstone round beads Quantity: one strand approx 14" long 3 sizes available: 6mm (55 - 60 beads), 8mm (43 - 48 beads), 10mm (35 - 39 beads), please choose your preferred size from the drop-down list under the item title 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 - 1.5mm 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