Synthetic Cubic Zirconia (CZ)
A syntetic diamond is a man-made material

Transparent, colorless, man-made material marketed as a diamond simulant under a number of proprietary names. It is singly refractive, with an R.I. of 2.15 and an S.G. of 5.80; its dispersion is 0.060; and its hardness 8.25 to 8.5 (Mohs scale). Yellow CZ is used to imitate fancy intense yellow diamonds, but CZ does not show the 415 nm absorption line seen in fancy diamonds (although it may show lines in the 453 nm and 478 nm areas).

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