Inner circumference: Approximately 15cm, 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: 10mm Button-cut crystal 64-facet cut crystal: 6mm Orange moonstone: 6mm Aquamarine: 4.5mm Lavender amethyst: 6mm Citrine (heat treated): 4mm Crystal: 5mm Rose quartz: 8mm Lavender amethyst: 10mm 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. The stones may have small scratches, inclusions, color variations, dents, and natural cracks. This is handmade by an amateur, so please refrain from purchasing if you are looking for perfection. 3