Tourmaline approximately 5mm Inner diameter: approximately 15.5cm The main effects of tourmaline are said to be mental and physical healing, stress reduction, space purification, 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. ★ Dzi beads may have color unevenness, uneven burning, and agate patterns. Please understand. ★ Opelet rubber is a consumable item and may deteriorate under various conditions. ★ Returns, refunds, exchanges, cancellations, and complaints are not accepted. ★ We are not responsible for any shipping troubles. ★ The color may look slightly different because it is taken with a smartphone camera. #healing_crystal Thank you for viewing.