Natural Multi-coloured Tourmaline semi-precious gemstone round beads Quantity; one strand approx 20" long Size: approx 3mm - 3.2mm per bead 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 0.5mm in size Hole size: approx 0.30mm Packed and dispatched from West Yorkshire, UK