gemstone

Opal ring

Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)

AI-generated identification · may be incorrect

The cabochon shows vivid blue-green color and patchy play-of-color, set in metal with dark accent stones. Opal has Mohs hardness 5.5–6.5, vitreous-to-waxy luster, no cleavage, and low specific gravity around 2.0–2.2; the image suggests treated or lab-created material.

Identified September 8, 2026More gemstone →

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At a glance

Common name: Opal ring
Scientific name: Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)
Category: gemstone
Identified: September 8, 2026
Method: Standard

AI Estimated Value

Approximately $20–$150 for a fashion or synthetic-opal ring; natural fine opal jewelry can range from $200 to several thousand dollars, depending on origin and quality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Natural opal forms when silica-rich groundwater deposits gel in cavities and fractures, commonly in volcanic or sedimentary host rocks; deposits are generally Cenozoic. Bright, uniform blue-green material in jewelry is often synthetic, composite, or dyed rather than natural precious opal.

Uses & applications

Used primarily in jewelry and ornamental objects; natural fine opal is collectible, while synthetic or composite opal is an affordable jewelry material.

Geological facts

Opal is mineraloid rather than a true crystalline mineral because its silica structure is largely amorphous. Excessive heat or dehydration can cause opal to craze and crack.

Field identification & locations

Identify opal by its low hardness, light weight, waxy luster, and—if natural precious opal—changing spectral flashes when tilted; avoid destructive tests on mounted stones. Natural opal occurs notably in Australia, Ethiopia, Mexico, and the western United States.