Inner circumference: Approximately 16cm, with some margin of error. * If you wish to change the size (up to 17cm free of charge), please let me know after purchase. Larimar: 8.2mm Rondel Button-cut crystal Charoite: 7.2mm Sugilite: 6.8mm 64-facet cut crystal: 6mm Lavender amethyst: 6mm Double strand of Ope-ron rubber * The knots in the rubber are not secured with adhesive. If they come loose, gently pull them back in from the opposite side of the stone. Lavender amethyst has variations in color depending on the bead. The stones may have small scratches, inclusions, color unevenness, dents, and natural cracks. This is handmade by an amateur, so please refrain from purchasing if you are looking for perfection. 20