Inner diameter: approximately 16 cm Bead size: approximately 12 mm (early part of the range) Please understand that there may be some slight variations. It's a gentle purple that coexists with silica. Because it's mixed with silica, it's stronger than regular mica. As it is a natural stone, there may be cracks, inclusions, natural dents, black spots, color unevenness, and fine scratches. Natural stone Natural stone bracelet Design bracelet Purple umm (likely a typo, possibly meant "purple") Purple mica Mica in silica Power stone