925 sterling silver diamond cut ornate wispy design pendant with a gorgeous faceted solitaire pink cubic zirconia heart stone. The pendant measures 3/8 inch wide by 3/8 inch tall not including the bail. Cubic zirconia (CZ) is the cubic crystalline form of zirconium dioxide (ZrO2), and the crystal clear stone resembles diamonds. The synthesized material is hard and usually colorless but may be made in a variety of different colors. Cubic zirconia is relatively hard, 8–8.5 on the Mohs scale—slightly harder than most semi-precious natural gems.