gemstone

Polished dendritic agate cabochon (likely agate or jasper)

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque to translucent cream, orange, and red coloration with possible dendritic or plume-like inclusions; vitreous to waxy luster and no visible cleavage. The metal pendant setting is human-made, but the inset cabochon appears geological.

Identified August 16, 2026More gemstone →

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At a glance

Common name: Polished dendritic agate cabochon (likely agate or jasper)
Scientific name: Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions
Category: gemstone
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a common mounted cabochon; $50–$150+ for unusually attractive natural patterning or collectible provenance.

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 groundwater fills cavities in volcanic rock, depositing chalcedony and colored iron/manganese oxides in layers or patterns. Agate formation generally occurred during ancient volcanic episodes, commonly in Paleozoic–Cenozoic host rocks.

Uses & applications

Used for cabochons, pendants, beads, carvings, and ornamental objects; valued primarily for pattern, polish, and color.

Geological facts

The internal red-orange markings may be iron-oxide plume or dendritic inclusions rather than true crystal growth. A glass imitation can resemble it, but natural agate typically feels cool, resists scratching, and shows irregular internal patterns.

Field identification & locations

Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the western United States. Confirm with a loupe, hardness test on an inconspicuous edge, and inspection for natural banding or inclusions; the image alone cannot establish a precise variety.