What is CZ? CZ stands for cubic zirconia, a man-made stone used in place of diamonds. Cubic zirconia is the cubic crystalline form of zirconium dioxide. The synthesized material is hard, flawless, and bears great resemblance to a perfect diamond. Due to its low cost and great durability, CZ’s are often used with rhodium-plated sterling silver to emulate diamond and platinum jewelry. This alternative gives an expensive look at a more affordable price. The majority of our jewelry is made with cubic zirconia stones. We carry CZ rings, earrings, bracelets, and necklaces.