Inner diameter: approximately 16 cm Pseudomorph: approximately 15.5 mm - 16 mm Brown rutile: approximately 20.4 mm Please note that there may be slight variations. "Pseudomorph Crystal in Quartz" is a quartz crystal that contains an abundance of columnar crystals like rutile and tourmaline. "Pseudomorph" means "pseudocrystal," and the original mineral is presumed to be amphibole or plagioclase based on its shape, although it hasn't been definitively identified. Currently, the mineral is believed to have transformed into mica or halloysite. This is a design bracelet featuring rare pseudomorph and brown rutile packed with needles. Recommended for those who love inclusions! As these are natural stones, there may be cracks, inclusions, natural indentations, black spots, color unevenness, and minor scratches. Natural stone Natural stone bracelet Design bracelet Rutile quartz Brown rutile quartz Pseudomorph crystal in quartz Rare stone Power stone