Tourmaline approximately 5mm Inner diameter: Approximately 16cm The main effects of tourmaline are said to be healing of body and mind, stress reduction, purification of space, and health promotion. This is due to the physical properties of tourmaline, such as the emission of negative ions, far-infrared rays, and static electricity suppression. Spiritual effects such as mental stability and promotion of positive thinking are also expected. ★ Brand new and unused. ★ Since they are natural stones, there may be chips, dents, inclusions, and cracks. Please consider this, understanding the characteristics of natural stones. ★ There may be color unevenness, burning unevenness, and agate patterns on the dzi beads. Please understand. ★ Opeon rubber is a consumable item and may deteriorate under various conditions. ★ Returns, refunds, exchanges, cancellations, and claims are not accepted. ★ We are not responsible for any shipping troubles, so please understand. ★ The colors may look slightly different because they are taken with a smartphone camera. #healing_crystal Thank you for viewing.