gemstone

Red garnet gemstone

Garnet group; likely almandine–pyrope, (Fe,Mg)₃Al₂(SiO₄)₃

AI-generated identification · may be incorrect

Hardness 6.5–7.5 Mohs; deep red color, vitreous luster, transparent to translucent, commonly faceted in the cubic/isometric crystal system with no cleavage. The image shows a small polished or faceted red stone, though exact species requires testing.

Identified September 2, 2026More gemstone →

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Physical properties

Formation & geological history

Garnets form mainly in metamorphic rocks such as schist and gneiss, and also in some igneous rocks and alluvial deposits; many formed during ancient mountain-building events from Precambrian to younger ages.

Uses & applications

Used as an inexpensive-to-fine jewelry gemstone and as an abrasive; gem-quality stones are cut for rings, pendants, and collectors.

Geological facts

Red garnets are commonly almandine or pyrope; color and refractive index vary substantially across the solid-solution series.

Field identification & locations

Identify by saturated red color, glassy luster, high density, and lack of cleavage; confirm with hardness, specific gravity, refractive index, or spectroscopy. Major sources include India, Sri Lanka, Mozambique, Tanzania, Madagascar, and the United States.