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, even after purchase. Larimar 8mm 64-facet cut crystal 6mm White chalcedony 6mm Aquamarine 4.5mm Mother of pearl 6mm Crystal 4mm Button-cut crystal Mother of pearl 8mm Double-strand Ope-ron rubber * The rubber knots 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. 34