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10. The Allnatt Diamond : $3 Million.
This diamond is named after Major Alfred Ernest Allnatt — he was one of the holders of the diamond. The Allnatt diamond has size of 101.29 carat (20.258 g – Carat weight explained here). The diamond color is rated as fancy vivid Yellow by the Gemological Institute of America. No one know precisely where the diamond was found, but some experts say that the diamond was found where the De Beers premier diamond mine now located.
9. The Moussaieff Red Diamond : $7 Million.
The Moussaieff Red Diamond is 5.11 carats (1.022 g) diamond with a triangular brilliant cut that is rated as Fancy Red in colour by the Gemological Institute of America (GIA). Although Moussaieff is relatively small compared to other expensive diamonds, this is the largest fancy red ever rated by GIA.
8. The Heart of Eternity : $16 Million.
The Heart of Eternity is a 27.64 carats (5.528 g) diamond with a color rated as Fancy Vivid Blue by the Gemological Institute of America. This diamond is a very rare class of colored diamond. It was cut by the Steinmetz group before it sold to De Beers Group. The diamond itself was found in a premier diamond mine in South Africa.
7. Wittelsbach Diamond : $16.4 Million.
The Wittelsbach diamond (Der Blaue Wittelsbacher) is a 35.36 carat (7.11 g) blue diamond with a size of 40 mm in diameter with 8.29 mm in depth and VS 2 in clarity. It has become part of both Austrian and Bavarian crown jewels, with color and clarity that has been compared to the Hope Diamond.
6. The Steinmetz Pink : $25 Million.
The Steinmetz Pink is a 59.60 carat (11.92 g) diamond that is rated as Vivid Pink by the Gemological Institute of America.
5. De Beers Centenary Diamond: $100 Million.
The De Beers Centenary Diamond was classified as D level by the Gemological Institute of America. Itâs the highest grade of a diamond that is colorless flawless. The diamond itself is 273.85 carats (54.77 grams) in weight. This diamond is the 3rd largest diamond that has been produced by De Beerâs Premier Mine.
4. The Hope Diamond: $350 Million.
The Hope Diamond is a 45.52 carat (9.10 gram) large diamond that is now located in the Smithsonian Museum of Natural History in Washington DC. The diamond looks blue in color to the naked eye because the number of traces of boron in the crystal structure but it shines red under ultraviolet light.
3. The Cullinan: $400 Million.
The Cullinan Diamond is 3,106,75 carats (621.35 grams) and is the largest rough gem quality diamond ever found in the world. After polished it became Cullinan I. At 530.2 carats, (106.0 grams) it was the largest diamond in the world until 1985 when the Golden Jubilee of 545.67 carats, (109.13 grams) was found at the same mine.
2. The Sancy Diamond: (Priceless)
The Sancy diamond is 55.23 carats (11.05 grams) of pale yellow diamond that once was famous for belonging to one of the Great Moguls. Itâs believed that the diamond is of Indian origin. This is the first large diamond to be cut with symmetrical facets. The stone is also unusual because it has no pavilion â just a pair of crowns, one on the other. This historical diamond is now kept in the French Crown Jewel collection housed at the Louvre.
1. Koh-I-Noor: (Priceless)
Koh-I-Noor means as âMountain of Lightâ in Persian. Itâs a 105 carat (21.6 gram) diamond that was once the largest known diamonds in the world. The Koh-I-Noor  originated at Golconda in the Andhra Pradesh state of India. It was owned by various Sikh, Mughals and Persian rulers that fought each other from time to time. The stone was found to measure 36.00 Ă 31.90 Ă 13.04 mm. The gem remains the property of the British crown and is kept in the HM Tower of London and is a popular tourist attraction.