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Cubic zirconia (ie "Soviet diamond"), which was first introduced by the former Soviet Union, the most ideal diamond substitutes or pseudo products, is man-made compounds, no natural minerals. The cubic zirconia is very close to the natural diamond in terms of refractive index and dispersion. But its hardness is lower (8.5) The proportion is the diamond 1.6-1.7 times times, reaches 5.6-6, and the thermal conductivity is far below the diamond, therefore still may use the instrument to distinguish it accurately with the diamond.