gemstone

Polished red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown with subtle banding, opaque, and polished to a smooth vitreous-to-waxy luster. Quartz crystals are microscopic, so individual crystal structure and cleavage are not visible.

Identified October 2, 2026More gemstone →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, with iron-bearing minerals producing its red color. It occurs in rocks of many geological ages and commonly forms in volcanic or sedimentary settings.

Uses & applications

Used for pendants, beads, carvings, and ornamental objects; this example is shaped and polished with a metal bail.

Geological facts

Jasper is a rock composed mostly of quartz and may show patterns from mineral impurities or successive silica deposition.

Field identification & locations

Identify it by its opacity, hardness, smooth polish, and red-to-brown color; jasper occurs worldwide, including India, Australia, Brazil, and the United States. A small mass-produced pendant commonly sells for about $5–$30, depending on workmanship and metal setting.