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Cubic zirconia
Apr 04, 2018

The density of cubic zirconia is quite high, with a specific gravity of 5.6 to 6.0. Its hardness of 8.5, although less than diamonds, has exceeded most of the natural stones. Its refractive index is 2.15 to 2.18 and its surface has a diamond sheen. Dispersion index of 0.058 to 0.066, more than diamonds.

Cubic zirconia has no cleavage (Cleavage) and its fracture is Conchoidal fracture, and it is fragile. In the short-wave ultraviolet light is yellow, yellow-green fluorescence, under the long-wave ultraviolet light is not obvious.

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