gemstone

Green polished gemstone (likely chrysoprase or aventurine)

Chrysoprase: microcrystalline quartz, SiO₂, colored by nickel; possible aventurine quartz: SiO₂ with fuchsite mica

AI-generated identification · may be incorrect

Small polished cabochon with translucent mint-green color and vitreous luster; quartz hardness is about 7 Mohs, with no visible cleavage and conchoidal fracture. The image cannot confirm mineral identity; a smooth glass imitation is also possible.

Identified August 12, 2026More gemstone →

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At a glance

Common name: Green polished gemstone (likely chrysoprase or aventurine)
Scientific name: Chrysoprase: microcrystalline quartz, SiO₂, colored by nickel; possible aventurine quartz: SiO₂ with fuchsite mica
Category: gemstone
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small common polished piece; $50–$200+ if confirmed as fine, translucent chrysoprase.

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

Chrysoprase forms when nickel-bearing fluids alter ultramafic rocks, while green aventurine forms in quartz-rich hydrothermal veins; both are generally geologically young compared with their host rocks.

Uses & applications

Used for cabochon jewelry, beads, carvings, and ornamental objects; quality depends on saturated color, translucency, and absence of fractures.

Geological facts

Chrysoprase is one of the most valuable chalcedony varieties and can fade with prolonged heat or sunlight. Aventurine commonly shows glittering mica inclusions, which are not apparent here.

Field identification & locations

Common sources include Australia, Brazil, Tanzania, Poland, and the United States. Check with a loupe for natural color and inclusions, test hardness only on an unimportant area, and use gemological testing to distinguish it from glass.