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Many places offer a wide selection of cubic zirconia jewelry. These brilliant sparkling stones demand attention wherever they go. But what is cubic zirconia (CZ), and how is it made?A cubic zirconia is a man-made gemstone. They replicate the fire and flash of perfect diamonds, but at a fraction of the cost. Placed into fine gold or sterling silver settings, a cubic zirconia is almost indistinguishable from a genuine diamond. Only trained gemologists can tell the difference between the two.While CZ crystals have been known since 1937, early crystals were too small for jewelry-making. In the 1970's, scientists discovered how...