Multi-Colored Lava Rock Beads in 10mm, Round, 15.5" Inch Strand, Volcanic Rocks. Great Semi Precious Gemstone Bead Supplies #SD-S7950 Quantity: 15.5" Inch Full Strand (39pcs Approx) Gemstone: Lava Rock (Igneous Rock) Bead Diameter: 10mm to 11mm (Approx) Bead Hole Size: 1mm (Approx) Color: Multi-Colored (Mixture of Yellow, Green, Red, Blue, Purple)