This is Aventurine Feldspar (name at the time of purchase). It sparkles. There are also cloudy areas. Size: Approximately 8.1mm Inner diameter: Approximately 16cm * As natural stones are natural, there may be fine scratches and small dents, but this is due to the nature of the stone and is not a defect. Please purchase only if you understand this. Aventurine Feldspar Natural stone Power stone bracelet Power stone