This was a gift from my aunt. I'm selling it because I don't use it and would like to pass it on to someone who will. I don't know what kind of stone it is. Simplified Buddhist prayer beads Main beads: Black beads Parent beads and two heavenly beads: Transparent beads It was in the closet without a box. Main beads: Approximately 10mm Parent beads: Approximately 14mm Two heavenly beads: Approximately 8mm From the parent bead upwards: Approximately 11.5cm Weight: Approximately 20.1g *Measurements are approximate. Please allow for some error. T12258 #Simplified Buddhist prayer beads #Prayer beads #Buddhist prayer beads #Buddhism Y