gemstone

Likely opal-inlay cross pendant

Opal (hydrated amorphous silica, SiO₂·nH₂O); central red stone is unidentified

AI-generated identification · may be incorrect

The pale inserts show opal-like iridescence, but the photo cannot confirm whether they are natural opal or imitation. Opal has no crystal structure, Mohs hardness about 5.5–6.5, and a vitreous to waxy luster; the setting and cord are jewelry materials, not geological specimens.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Natural opal forms as silica-rich water deposits gel in rock cavities and fractures; deposits range from ancient to geologically recent. The red center may be garnet or glass, but it is not identifiable from this image.

Uses & applications

Decorative jewelry; opal is also collected and used in ornamental objects.

Geological facts

Opal’s play-of-color comes from light diffraction by regularly arranged microscopic silica spheres; not all opal displays it.

Field identification & locations

The pendant appears to contain stone inlays, so it qualifies as a geological specimen, but visual inspection alone cannot establish their material or natural origin. Check for characteristic color flashes and have a jeweler or gemologist test the inserts.