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Black diamonds are rare, valuable, and opaque diamonds that are made of carbon. They are also known as carbonados.

Appearance

Black diamonds have a high luster and opaque appearance

They can appear metallic due to their deep color and shine

They can be black, dark gray, green, or brown

They have an uneven surface, even under magnification

Composition

Black diamonds are made of carbon, graphite, and amorphous carbon

They have natural inclusions of graphite, pyrite, or hematite

Hardness

Black diamonds are very hard and measure a 10 on the Mohs scale of mineral hardness

This makes them difficult to cut and polish

Origin

Black diamonds are found in alluvial deposits in equatorial regions, such as Central Africa and Brazil

Small amounts have also been found in Venezuela and Eastern Australia