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In page Cubic zirconia:

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  • Color: only the rarest of diamonds are truly colorless, most having a tinge of yellow or brown to some extent. A cubic zirconia is often entirely colorless: equivalent to a perfect "D" on diamond's color grading scale. That said, desirable colors of cubic zirconia can be produced including near colorless, yellow, pink, purple, green, and even multicolored.
  • Thermal conductivity: Cubic zirconia is a thermal insulator whereas diamond is the most powerful[citation needed] thermal conductor. This provides the basis for Wenckus’ canonical identification method, the industry standard.[3]