metamorphic

Carved nephrite jade thumb ring/seal

Nephrite jade: fibrous amphibole aggregate, chiefly tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; dark olive-green color, greasy to vitreous luster, opaque, and extremely tough due to interlocking microscopic amphibole fibers. The object is polished and carved, with a band-like ring form.

Identified September 19, 2026More metamorphic →

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At a glance

Common name: Carved nephrite jade thumb ring/seal
Scientific name: Nephrite jade: fibrous amphibole aggregate, chiefly tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
Category: metamorphic
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $20–$150 for common carved nephrite; $200–$1,000+ if verified high-quality jade with desirable provenance and craftsmanship.

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

Nephrite forms through metamorphism and metasomatism of magnesium-rich rocks, commonly in serpentinite zones; deposits range from Paleozoic to younger geologic ages. This specimen’s exact locality and age cannot be determined visually.

Uses & applications

Used for carvings, seals, ornaments, beads, and jewelry; its exceptional toughness made it historically important for tools and ceremonial objects. It is not primarily a construction stone.

Geological facts

The visible dark-green, waxy appearance and fine polish are consistent with nephrite, but jadeite, serpentine, bowenite, or dyed stone can look similar. Laboratory testing is needed for definitive identification.

Field identification & locations

Check for dense weight, uniform fibrous texture, strong toughness, and a warm greasy luster; avoid relying on color alone. Common sources include China, British Columbia, Siberia, New Zealand, and Wyoming.