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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