gemstone

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Hardness: 10 (Diamond) vs 8.0-8.5 (CZ); Color: Colorless; Luster: Adamantine; Crystal Structure: Isometric; Cleavage: Perfect octahedral (Diamond) vs none (CZ); Specific Gravity: 3.52 (Diamond) vs 5.6-6.0 (CZ)

Hardness: 10 (Diamond) vs 8
Color: Colorless
Luster: Adamantine

Identified July 6, 2026More gemstone →

Explore Colorless Gemstone (possibly Diamond or Cubic Zirconia) in the encyclopedia →

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Physical properties

Formation & geological history

Diamonds form in the Earth's mantle under extreme pressure and temperature, brought to the surface by kimberlite pipes; Cubic Zirconia is usually synthetic and created via the skull melt process.

Uses & applications

Diamond is used in high-end jewelry and industrial abrasives; Cubic Zirconia is primarily used as a diamond simulant in affordable jewelry.

Geological facts

Diamonds are the hardest known natural substance. Cubic Zirconia was first synthesized in 1970 for laser technology before becoming a jewelry staple.

Field identification & locations

Identify by testing thermal conductivity or specific gravity; real diamonds typically have sharper facet edges and higher dispersion than glass but look different from CZ under a jeweler's loupe.

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