gemstone

Tumbled ruby in matrix

Corundum (Al₂O₃), commonly with mica, calcite, or other matrix minerals

AI-generated identification · may be incorrect

Hardness is about 9 Mohs for ruby, though the mottled matrix is softer; vivid pink-red to purple color, vitreous luster, and irregular granular texture. This polished/tumbled specimen is opaque to translucent and lacks obvious cleavage.

Identified August 16, 2026More gemstone →

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Physical properties

Formation & geological history

Ruby forms through high-grade metamorphism or igneous-related processes, commonly in marble or aluminous metamorphic rocks; many commercial specimens originate in Myanmar, India, Afghanistan, and Mozambique. The geological ages vary widely by deposit, commonly Precambrian to younger.

Uses & applications

Used as a decorative tumbled stone, lapidary material, and collector specimen; transparent ruby is valuable jewelry material, while matrix-rich pieces have modest ornamental value.

Geological facts

The appearance may also represent dyed or treated ruby-bearing rock, so visual identification alone cannot confirm natural ruby or treatment.

Field identification & locations

Look for strong red/purple corundum areas, exceptional hardness, and associated contrasting matrix; a scratch test should not be performed on valuable material. Common sources include Myanmar, India, Afghanistan, and Mozambique.