gemstone

Iridescent opal-like specimen

Likely common opal (hydrated amorphous silica, SiO₂·nH₂O), possibly treated or synthetic

AI-generated identification · may be incorrect

Hardness about 5.5–6.5 Mohs; translucent pink-to-blue body with strong surface iridescence and a vitreous-to-waxy luster. Opal lacks a true crystal structure and commonly has conchoidal fracture; the image is insufficient to confirm natural origin.

Identified September 9, 2026More gemstone →

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At a glance

Common name: Iridescent opal-like specimen
Scientific name: Likely common opal (hydrated amorphous silica, SiO₂·nH₂O), possibly treated or synthetic
Category: gemstone
Identified: September 9, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 if common, treated, or synthetic; $50–$500+ for attractive natural precious opal, depending on confirmed origin and play-of-color.

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 hydrated silica in cavities and fractures, commonly in volcanic or sedimentary environments, generally during the Cenozoic. Bright uniform color or unusual fluorescence may indicate dyeing, coating, or lab production.

Uses & applications

Used as a gemstone, cabochon, ornament, and collector specimen; common opal has limited industrial use. High-quality natural precious opal can be valuable.

Geological facts

The colorful effect is play-of-color caused by diffraction from regularly arranged silica spheres, while body color comes from impurities and inclusions.

Field identification & locations

Check for natural matrix, irregular color distribution, and a waxy surface; a loupe, specific-gravity test, and examination of drilled holes or edges can reveal treatments. Major sources include Australia, Ethiopia, Mexico, and Nevada.