Sri Lankan Blue Moonstone Inner diameter: Approximately 18 cm (Please feel free to message me if you would like to adjust the inner diameter or change the string to a transparent silicone rubber ^ ^) Approximately 11 mm Returns are not accepted. I am also selling this item elsewhere, so there may be cases where I have to cancel your purchase (つェ⊂) The price will not change even if the inner diameter is adjusted. Extra beads will also be included. Thank you very much! Material: Natural stone Bracelet/Bangle: Bracelet