4. The Hope Diamond : $350 Millions

The hope diamond is 45.52 carats (9.10 grams) large diamond that 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 shine a red phosphor under ultraviolet light.

3. The Cullinan : $ 400 Millions

The Cullinan Diamond is 3,106,75 carats (621.35 grams) diamond and is the largest rough gem quality diamond ever found in the world. After polished it become Cullinan I or Star Africa first and at 530.2 carats (106.0 grams) is the largest diamond in the world until 1985 with the Golden Jubilee of 545.67 carats (109.13 grams) from the same premier Mine.