gemstone

Tumbled blue-green stone, likely chrysoprase or dyed chalcedony

Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs, waxy to vitreous luster, opaque to translucent, blue-green color, and no visible cleavage; the smooth elongated shape indicates tumbling or carving. The unusually vivid blue-green color may indicate dyeing or another mineral such as turquoise.

Identified August 24, 2026More gemstone →

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At a glance

Common name: Tumbled blue-green stone, likely chrysoprase or dyed chalcedony
Scientific name: Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing
Category: gemstone
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small tumbled stone; $30–$150+ for attractive natural chrysoprase or quality carved material.

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

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; chrysoprase gets its green color from nickel. Formation ages vary widely, while the specimen’s present shape is human-processed.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive jewelry; attractive polished pieces are collected as lapidary material.

Geological facts

Chrysoprase is a quartz variety, not a separate mineral species. Color can fade with prolonged heat or strong sunlight, and dyed chalcedony commonly has unnaturally intense, uniform color.

Field identification & locations

Look for a smooth waxy surface, conchoidal fracture, and quartz-like hardness; it should scratch glass but not be scratched by a steel blade. Common sources include Australia, Brazil, Madagascar, and Central Asia; laboratory testing is needed to distinguish chrysoprase, turquoise, and dyed material.