| index. CZ has a refractive index of 2.176, compared to a diamond's 2.417.
Cut. Under close inspection with a loupe, the facet shapes of some CZs appear different from diamonds.
Color. More precisely, the lack of color: Only the rarest of diamonds are truly colorless, most having a tinge of yellow or brown to some extent. By comparison, CZ can be made in most cases entirely colorless: equivalent to a perfect "D" on diamond's color grading scale.
Thermal conductivity. CZs are thermal insulators whilst diamonds are among the most efficient thermal conductors, exceeding copper. This makes telling the difference between diamond and CZ quite easy for those with the right instruments.
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