Blue diamonds are extremely rare and are mainly mined in certain regions of South Africa, particularly in the famous Cullinan Mine, which has produced some of the world's most famous blue diamonds. An NF Blue diamond with high clarity can be expected to cost between CHF 180,000 and CHF 350,000 per carat. For a stone with fancy intense/vivid color, the price rises to at least CHF 400,000 per carat.