fossil

Pearl oyster shell with natural pearls

Molluscan shell, likely Pinctada spp.; pearls are aragonite (CaCO₃)

AI-generated identification · may be incorrect

Biogenic carbonate specimen rather than a conventional rock; nacre has pearly luster, layered aragonite crystal structure, Mohs hardness about 3.5–4, and white, cream, lavender, and brown coloration. Pearls are concentric nacre around an irritant.

Identified August 27, 2026More fossil →

Explore Pearl oyster shell with natural pearls in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Pearl oyster shell with natural pearls
Scientific name: Molluscan shell, likely Pinctada spp.; pearls are aragonite (CaCO₃)
Category: fossil
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for an ordinary shell; $50–$500+ for attractive natural pearls and a well-preserved specimen, depending on size, luster, provenance, and authenticity.

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

Formed by a living pearl oyster secreting nacre around a parasite or foreign particle; the shell grew during the animal’s lifetime, while pearls may form over months to years. It is not datable as a geological rock unless fossilized.

Uses & applications

Used for jewelry, ornaments, buttons, and educational or natural-history display; intact oyster shells and attractive natural pearls can be collectible.

Geological facts

The iridescence comes from light interference in microscopic aragonite platelets. The image appears to show several small natural pearls inside a cut-open oyster shell.

Field identification & locations

Identify by the hinged shell, mother-of-pearl interior, and rounded nacreous bodies; distinguish from glass or imitation pearls using surface texture and nacre structure. Commonly associated with tropical and subtropical Indo-Pacific and other warm marine waters.