10. The Allnatt Diamond ($ 3 Million)
The Allnatt Diamond is a diamond the size of 101. 29 carat (20. 258 g) with a cushion cut, rated in color as Fancy Vivid Yellow by the Gemological Institute of America. The diamond is named after one of the holders, Major Alfred Ernest Allnatt, a soldier, sportsman, art patron and benefactor. Although not known precisely where the originating Allnatt, many experts believe that it may be found in what is now known as the De Beers Premier Diamond Mine.
9. The Moussaieff Red diamond ($ 7 Million)
The Moussaieff Red is displayed as part of the Smithsonian’s “The Splendor of Diamonds” exhibition, in addition to the De Beers Millennium Star and The Heart of Eternity. The Moussaieff Red Diamond is a diamond measuring 5. 11 carats (1. 022 g) with a triangular brilliant cut (Sometimes Called a trillion or a trilliant cut), rated in color as Fancy Red by the Gemological Institute of America. Moussaieff Red Diamond is a diamond the size of 5. 11 carat (1. 022 g) with a triangular brilliant cut, given a color as Fancy Red by the Gemological Institute of America. Although this may seem relatively small when compared to other famous diamonds, in fact, the Moussaieff Red is the largest Fancy Red the GIA reports having value.
Moussaieff Red Diamond
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Africa – South Africa is the main producer of diamonds in Africa. Namibia is another country that produces diamonds Africa. Namibia is not a big producer as far as quantity is concerned, but its diamonds are of a high quality, 95% of the diamonds mined in Namibia’s Skeleton Coast are gem quality diamonds. Angola – as Namibia – is rich with alluvial deposits. A state-owned mining company carries out Angola’s mining, but because of many internal conflicts it is difficult to install a stable and regular marketing of the diamonds.
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The diamond is a natural mineral composed mostly of carbon (99.95%). The diamond’s crystal structure belongs to the cubic system. The diamond is usually an octahedron and less often has the shape of a cube or a dodecahedron. The following conditions are needed to transform carbon into a diamond crystal: a pressure of 100,000 bars and a temperature of about 2,500ºC. Ambient conditions of this type only occur at depths of 130-200 kilometres below the surface of the earth in active volcanoes. Diamonds melting point is 3,700ºC, its specific gravity is 3.52, its hardness is 10 and its refractive index is 2.417.
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