gemstone

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic ZrO₂), possibly glass or quartz

AI-generated identification · may be incorrect

Oval brilliant cut, transparent and colorless with strong facet sparkle. Cubic zirconia has Mohs hardness ~8–8.5, adamantine luster, cubic crystal structure, no cleavage, and specific gravity ~5.6–6.0; the image alone cannot distinguish it definitively from glass or quartz.

Identified August 8, 2026More gemstone →

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Physical properties

Formation & geological history

Most likely laboratory-grown cubic zirconia rather than a natural mineral; zirconia crystals are produced industrially and cut as simulants. If natural quartz, it formed in silica-rich hydrothermal cavities, commonly in much older igneous or metamorphic rocks.

Uses & applications

Jewelry and decorative pieces; cubic zirconia is an inexpensive diamond simulant. A loose stone of this apparent size is typically worth about $2–$30, depending on cut and quality; glass is usually under $5, while natural quartz may sell for $5–$50.

Geological facts

The unusually bright, rainbow-like flashes and high apparent dispersion favor cubic zirconia. Diamond would generally show greater hardness and a higher-value cut, but identification requires testing.

Field identification & locations

A loupe may reveal facet abrasions or bubbles: scratches and bubbles suggest glass; rounded facet edges and moderate sparkle suggest quartz; crisp facets, strong fire, and high density favor cubic zirconia. The reported Santiago-area location does not materially identify a loose cut gem.