gemstone

Mixed polished gemstone bead lot, likely dyed agate and quartz

Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties

AI-generated identification · may be incorrect

Small rounded, polished beads in blue, green, purple, gray, and orange; vitreous to waxy luster, translucent edges, and no visible cleavage. Quartz hardness is about 7 Mohs and specific gravity about 2.60–2.65; coloration appears partly dye-enhanced, so individual beads may differ.

Identified August 11, 2026More gemstone →

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At a glance

Common name: Mixed polished gemstone bead lot, likely dyed agate and quartz
Scientific name: Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties
Category: gemstone
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a mixed strand or loose lot; approximately $20–$100+ if confirmed natural, high-quality agate or amethyst.

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; later cutting, drilling, polishing, and often dyeing produced these beads. Natural host formation ranges from ancient Paleozoic to younger volcanic settings, depending on source.

Uses & applications

Used for necklaces, bracelets, craftwork, and decorative objects. Common commercial bead material has modest value; natural, well-patterned agate or genuine amethyst beads can be worth more.

Geological facts

The lot is heterogeneous rather than a single identifiable rock, and the vivid uniform blue/green colors strongly suggest treatment. Quartz-based beads commonly show conchoidal fracture and remain scratch-resistant.

Field identification & locations

Likely sources include Brazil, Uruguay, India, Madagascar, China, and Indonesia. Inspect for banding, dye concentration in drill holes, bubbles, or color pooling; a quartz bead should not be scratched by a steel knife.