metamorphic

Polished greenstone ring/bead

Likely nephrite jade (actinolite–tremolite amphibole aggregate), possibly serpentine or bowenite

AI-generated identification · may be incorrect

Dark olive-green, mottled, waxy-to-greasy luster with a fine fibrous texture; nephrite hardness is about 6–6.5 Mohs, tough, and non-cleavable to the unaided eye. The ring is shaped and highly polished, so diagnostic features are partly obscured.

Identified September 18, 2026More metamorphic →

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At a glance

Common name: Polished greenstone ring/bead
Scientific name: Likely nephrite jade (actinolite–tremolite amphibole aggregate), possibly serpentine or bowenite
Category: metamorphic
Identified: September 18, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 if common serpentine or low-grade nephrite; $50–$300+ for well-authenticated, attractive nephrite, with exceptional jade far higher.

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 when magnesium-rich rocks undergo metamorphism and fluids promote amphibole growth, commonly in subduction-zone mélanges; deposits range from Paleozoic to Cenozoic. Serpentine-group alternatives form through hydrothermal alteration of ultramafic rocks.

Uses & applications

Used for carvings, beads, rings, tools, and ornamental objects; quality jade can be valuable, while serpentine or imitation material is inexpensive.

Geological facts

Nephrite’s interlocking fibrous crystals give it exceptional toughness, allowing thin carvings and durable jewelry. Color alone cannot reliably distinguish jade from serpentine or dyed stone.

Field identification & locations

Look for a dense, cool-feeling stone with an even polish, subtle fibrous grain, and no bubbles; a refractometer, specific-gravity test, or gemological lab is needed for confident identification. Common sources include China, British Columbia, New Zealand, Siberia, and Wyoming.