gemstone

Agate and Chalcedony Beads

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Variegated browns, creams, oranges, and greens; Luster: Waxy to vitreous; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Variegated browns, creams, oranges, and greens
Luster: Waxy to vitreous

Identified July 21, 2026More gemstone →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Variegated browns, creams, oranges, and greens; Luster: Waxy to vitreous; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in cavities within volcanic rocks (basalt) or sedimentary rocks through the deposition of silica from groundwater over millions of years. This process creates the characteristic banding and translucency.

Uses & applications

Primarily used for jewelry, lapidary arts, decorative beads, and collectible specimens. Historically used for talismans and hardstone carvings.

Geological facts

Agate is a variety of chalcedony characterized by color banding. The green beads in this strand may be moss agate or aventurine, while the brownish stones are carnelian or sard varieties.

Field identification & locations

Identified by its waxy luster, translucency, and varied color patterns. Commonly found in riverbeds and volcanic regions worldwide; these specific polished beads are typical of many vintage gemstone necklaces.

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Diamond and Gold Jewelry

Carbon (Diamond) / Au (Gold)

gemstone

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)

mineral

Cubic Zirconia (simulant) or Diamond

ZrO2 (Cubic Zirconia) or C (Diamond)

gemstone

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Cubic Zirconia (or possibly Diamond)

Zirconium dioxide (or Carbon)

gemstone

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

gemstone