Shop our Cubic Zirconia Jewelry Cubic zirconia (also called CZ) is a synthetic crystalline substance used as an affordable alternative to diamonds. Cubic zirconia is not a mineral; it is a man-made substance, not to be confused with the natural gemstone zircon. Though much less expensive than diamonds, the brilliance and crystal clarity of cubic zirconia make it one of today's most popular stones for an attractive-yet-inexpensive, diamond-like jewelry.
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