Inner diameter: approximately 16 cm Mica: approximately 12 mm (early) Amethyst: approximately 16.8 mm Please note that there may be slight variations. This is a faintly pink purple mica silica, as it was sourced as pink mica. The actual color is closest to image 3. This is a design bracelet featuring a beautiful, transparent amethyst at the top. 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 mica Purple mica Pink mica Purple mica in silica Power stone