gemstone

Green cabochon gemstone, likely chrysoprase or dyed chalcedony

Chrysoprase: cryptocrystalline quartz (SiO₂), nickel-colored chalcedony; alternatively dyed chalcedony

AI-generated identification · may be incorrect

Opaque to slightly translucent vivid green, vitreous-to-waxy luster, no visible crystal faces, and cabochon polish. Mohs hardness is about 6.5–7; specific gravity is approximately 2.55–2.65. The pictured metal setting and surface glare prevent definitive identification.

Identified September 16, 2026More gemstone →

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At a glance

Common name: Green cabochon gemstone, likely chrysoprase or dyed chalcedony
Scientific name: Chrysoprase: cryptocrystalline quartz (SiO₂), nickel-colored chalcedony; alternatively dyed chalcedony
Category: gemstone
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $10–$75 for a common mounted or dyed cabochon; $100–$500+ for confirmed, vivid natural chrysoprase, depending on size and quality.

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 chrysoprase forms when nickel-bearing groundwater alters ultramafic rocks, commonly in fractures and weathered zones; major deposits occur in Australia, Brazil, Tanzania, and Poland. Chalcedony formed from silica-rich fluids in cavities and veins, generally during younger hydrothermal or volcanic activity; exact age is specimen-dependent.

Uses & applications

Used for jewelry, especially rings, cabochons, beads, and carvings; lower-grade material may be dyed to imitate chrysoprase. The surrounding piece appears to be a silver-colored ring setting.

Geological facts

Chrysoprase is the best-known naturally green chalcedony; its color can fade with prolonged heat or strong sunlight. Similar green stones include aventurine quartz, jade, variscite, and dyed agate.

Field identification & locations

Check for natural uneven color and translucency, a waxy luster, and hardness sufficient to resist scratching by a steel blade; laboratory testing, refractive index, and spectroscopy are needed for confirmation. Green color alone is not diagnostic.