Inner diameter: 16+ mm While not a several-ten-thousand-yen quality, this Larimar has a turtle-shell pattern, is well-polished, and has a beautiful color. As shown in the images, there are natural black spots, but a perfect piece would be much more expensive. Please be aware of this. m(__)m Overall, I think it's a beautiful product. Please take a look at the pattern, luster, and compare it with others (o^^o) Larimar is said to be one of the world's three major healing stones, along with Charoite and Sugilite. It is known as a stone that calms the mind and gently heals stress and emotional fluctuations. ※【Regarding Size】 Please be sure to check the listed bead size and inner diameter. There are individual differences in wrist size and how it feels when worn, so we recommend comparing it with a bracelet you already own.