Flat Round with Ohm/Aum Natural Gemstone Pendant Keychain, with Alloy & Brass Findings, Size: about 89mm long, ring: 25.5x2.5mm, 20.5mm inner diameter, pendant: 38~39x32x6.5~7mm.Natural Amethyst, Quartz Crystal, Rose Quartz, Green Aventurine, Tiger Eye, Obsidian