LAST ONE A round brilliant-cut cubic zirconia Cubic zirconia (CZ) is a diamond simulant. The synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors. The resulting material is purportedly harder, more lustrous and more like diamond overall. It should not be confused with zircon, which is a zirconium silicate. It is sometimes erroneously called "cubic zirconium" Because of its low cost, durability, and close visual likeness to diamond, synthetic cubic zirconia has remained the most gemologically and economically important competitor for diamonds. Ring Size: 8 Attention : Style# 12