Lemurian seed crystal, approximately 11mm. ✨ Purchased from Sensei Shinobu. With a quality assurance certificate. Inner diameter: approximately 16cm. Please note that there are some cloudiness and crack-like features originally present. The string has been replaced to adjust the size. It will be shipped with a temporary string, so please replace it. *Please understand that there may be minor chips, dents, scratches, cracks, and imperfections inherent to natural stones, as well as slight color variations depending on the environment. Thank you.