mineral

Cubic Zirconia (Simulated Diamond)

Zirconium dioxide (ZrO2)

Hardness: 8-8.5 Mohs scale. Color: Typically colorless but can be synthesized in many colors. Luster: Adamantine. Crystal structure: Isometric (cubic). Specific Gravity: 5.6-6.0 (much denser than diamond).

Hardness: 8-8
Color: Typically colorless but can be synthesized in many colors
Luster: Adamantine

Identified April 26, 2026More mineral →

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Physical properties

Formation & geological history

While zirconium dioxide occurs naturally as the rare mineral baddeleyite, jewelry-grade cubic zirconia is a synthetic material grown in a laboratory using the 'skull melting' process. Commercial production began in the 1970s.

Uses & applications

Primary use is as a low-cost diamond alternative in jewelry. Also used as a thermal insulator in industrial applications and in optical components.

Geological facts

Cubic Zirconia is roughly 1.7 times heavier than a diamond of the same size. Unlike naturally occurring diamonds which often have inclusions, lab-grown CZ is usually entirely flawless.

Field identification & locations

Identify by weight (it will feel heavier than expected) and by its 'fire' (it has more rainbow light dispersion than a diamond). It will also show visible wear and scratches over time that a diamond would not.

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Mineral/Rock

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