gemstone

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown, cream, gray, and ochre orbicular pattern; vitreous to waxy luster when polished; cryptocrystalline, with no visible cleavage; specific gravity approximately 2.6. The specimen appears tumbled and highly polished.

Identified August 10, 2026More gemstone →

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At a glance

Common name: Polished orbicular jasper (likely ocean jasper)
Scientific name: Silicified microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
Category: gemstone
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a polished palm stone; $30–$150+ for unusually vivid patterns, large pieces, or quality cabochons.

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

Forms when silica-rich fluids replace or cement volcanic or sedimentary material, preserving rounded mineral or rock inclusions; many “ocean jasper” varieties formed in volcanic settings, commonly associated with Miocene-age rocks in Madagascar. Exact identification requires locality or testing.

Uses & applications

Used for cabochons, beads, carvings, polished palm stones, and decorative objects; generally valued as an attractive lapidary material rather than a rare gemstone.

Geological facts

Orbicular jasper is named for its circular or radiating inclusion patterns, produced by alternating silica-rich growth and mineral replacement. “Ocean jasper” is a trade name applied to several orbicular jasper varieties.

Field identification & locations

Identify by its opaque body, intricate rounded patterns, glassy polish, and inability to scratch with a steel knife; quartz should scratch glass. Common sources include Madagascar, Mexico, Oregon, and Australia.