mineral

Black onyx-style bead bracelet

Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.

AI-generated identification · may be incorrect

Smooth, glossy black spherical beads with white decorative beads; visible appearance alone cannot confirm the material. If chalcedony, hardness is about 6.5–7 Mohs, with a trigonal quartz structure and no distinct cleavage.

Identified September 25, 2026More mineral →

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At a glance

Common name: Black onyx-style bead bracelet
Scientific name: Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.
Category: mineral
Identified: September 25, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a simple bracelet; higher-quality natural stone or designer pieces may cost more.

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 precipitates in cavities or fractures, commonly in volcanic rocks; its geological age depends on the source deposit. The beads have been shaped and polished.

Uses & applications

Worn as jewelry; onyx and agate are also used for carvings and ornamental objects.

Geological facts

“Onyx” is a banded variety of chalcedony, but uniformly black jewelry beads are often dyed or sold under the name without visible banding.

Field identification & locations

The photo shows a finished bracelet, not enough detail to identify the bead material reliably. A gemological test or close inspection for banding, translucency, and dye concentration is needed; chalcedony occurs worldwide.