Tanzanite Silver Ring, Princess- Rich velvety colored lavender blue tanzanite (laboratory created) stands up tall and proud in this lovely ring. The filigree setting has eight knobby prongs, and the ring is pierced through and very dainty. The ring is cast in sterling silver. The setting is open beneath, and there is detail covering nearly every surface with mil grain, bead work, and fretwork. This stone is a lab corundum, which means a hardness of 9. This stone will be very durable for many years of wear.