gemstone

Red jasper pendant

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque red to reddish-brown, waxy to vitreous luster, cryptocrystalline quartz structure, with no visible cleavage and conchoidal fracture. The smooth rounded form is polished and drilled, so natural texture is partly obscured.

Identified August 27, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sedimentary and volcanic materials, with hematite/goethite producing the red color. Jasper deposits range from Precambrian to recent; the exact age and locality cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, pendants, and ornamental objects; occasionally as a decorative stone. Common polished pieces generally have modest value.

Geological facts

The strong red color is usually due to finely disseminated hematite rather than the quartz itself. Similar red glass, dyed chalcedony, or resin can imitate it, especially in inexpensive jewelry.

Field identification & locations

Common localities include India, Brazil, Madagascar, Uruguay, the United States, and Australia. Identify genuine jasper by its cool stone feel, high polish, opacity, fine-grained appearance, and resistance to scratching by a steel knife; avoid destructive tests on jewelry.