Black Aquamarine, approximately 8mm Inner diameter: approximately 15.5cm Black Aquamarine is a rare type of aquamarine that appears black or dark blue due to the inclusion of black minerals like black mica (biotite). Also known as "Black Beryl," it has a mysterious, midnight-sea-like color, and when light hits it, a star-like shimmer (shiller effect) appears. It is also known as a power stone that helps relieve stress and build good interpersonal relationships. Features: Appearance: A deep blue color close to black, with the color becoming darker the more inclusions it has. Shine: When exposed to light, the included minerals reflect the light, creating a star-like shimmer (shiller effect). Inclusions: Contains iron-rich minerals such as biotite (black mica) within the aquamarine. Origin: Mainly produced in Brazil, Russia, and Pakistan. Meaning and Effects as a Power Stone: Stress Relief and Healing: Said to calm the spirit and bring peace and tolerance to the heart. Communication Support: Helps build good relationships with those around you and is said to enhance kindness and compassion. Grounding: Said to bring stability and make you less susceptible to negative external influences. ★ Brand new, unused. ★ As it is a natural stone, 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. ★ Opelet rubber is a consumable item and may deteriorate under various conditions. ★ Returns, refunds, exchanges, cancellations, and complaints are not accepted. ★ Please note that we are not responsible for any shipping troubles. ★ The colors may appear slightly different due to the smartphone camera used for the photos. #healing_crystal Thank you for viewing.