gemstone

Opal ring

Precious opal, hydrated amorphous silica (SiO₂·nH₂O), set in a metal ring

AI-generated identification · may be incorrect

The oval cabochon shows a pale body color with multicolored play-of-color. Opal has no crystal structure, Mohs hardness about 5.5–6.5, and a vitreous-to-waxy luster; the setting obscures any natural matrix or cleavage features.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Opal forms as silica-rich water deposits gel in rock cavities and sedimentary pores, then hardens as water escapes. Its geological age varies by deposit; the photo alone cannot establish the stone’s origin or age.

Uses & applications

Used mainly in jewelry and collecting; opal is too soft and sensitive to impact and drying for many heavy-wear applications.

Geological facts

The shifting flashes are caused by light diffraction through regularly arranged microscopic silica spheres in precious opal.

Field identification & locations

Identify precious opal by its changing patches of spectral color as the stone tilts; a photo cannot confirm whether this is natural, synthetic, or imitation. Major sources include Australia, Ethiopia, and Mexico.