This is a natural stone bracelet made with high-quality Uruguayan amethyst, as you can see. Inner diameter: Approximately 17cm Approximately 9.2mm Uruguayan amethyst is known for its high transparency and beautiful purple color. It is popular as a power stone that excels in mental stability and relaxation. With its simple yet impactful bead size, it's a design that is easy to wear for both men and women.