mineral

Faceted Diamond or Cubic Zirconia

Carbon (C) for Diamond; Zirconium dioxide (ZrO2) for CZ

Hardness: 10 (Diamond) vs 8-8.5 (CZ). Color: Reddish to bluish white. Luster: Adamantine. Crystal structure: Isometric (Cubic). Cleavage: Perfect octahedral (Diamond) vs none (CZ).

Hardness: 10 (Diamond) vs 8-8
Color: Reddish to bluish white
Luster: Adamantine

Identified June 11, 2026More mineral →

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Physical properties

Hardness: 10 (Diamond) vs 8-8.5 (CZ). Color: Reddish to bluish white. Luster: Adamantine. Crystal structure: Isometric (Cubic). Cleavage: Perfect octahedral (Diamond) vs none (CZ).

Formation & geological history

Natural diamonds form in the Earth's mantle under extreme pressure and heat, then transported by volcanic pipes. Lab-grown CZ is synthesized using the skull-melt method.

Uses & applications

Used in jewelry as gemstones, industrial cutting tools (diamonds), and precision optics.

Geological facts

Diamonds are the hardest natural substance on Earth. Cubic Zirconia was developed in the 1970s as a more affordable, synthetically produced alternative that mimics diamond's fire.

Field identification & locations

In the field, diamond can be identified by its thermal conductivity and ability to scratch glass easily. A 'fog test' or relative weight can distinguish it from CZ (CZ is heavier).

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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Nephrite Jade

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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Metamorphic Rock

Biotite Schist

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