With it's diamond-like quality, Cubic Zirconia is one of the most popular choices for bridal jewelry. What is Cubic Zirconia? Cubic Zirconia (also called CZ) is an affordable alternative to diamonds. The brilliance and crystal clarity of Cubic Zirconia mimics the look and luxury of real diamonds, without the expensive price tag. Unlike diamonds, cubic zirconia is simulated to be absolutely flawless and mimics the look of the most expensive diamonds in its brilliance and clarity. Most high quality cubic zirconia is extremely difficult to distinguish from a real diamond, and it appears identical to the untrained eye.