Citrine ☆ 4th piece, a rainbow is visible ☆ Inner diameter: 17 cm (If you wish to adjust the inner diameter or change the string to a transparent silicone rubber, please feel free to message me ^ ^) Approximately 11 mm Returns are not accepted. Since I am also selling on other platforms, I may have to cancel your purchase. (T_T) The price does not change even if the inner diameter is adjusted. I will also include the extra beads. Thank you very much!