Orange and brown diamonds, often called cognac, champagne and even cinnamon diamonds, are formed by the presence of nitrogen.

A pure orange colour is the rarest colour of this category and is caused by a combination of nitrogen atoms and structural deformities. 

Brown tone diamonds are mined in Australia, Borneo, Brazil, the African continent and Russia. Orange diamonds are found in South Africa, the Democratic Republic of Congo and Russia.

Coloured Diamond