These 7 diamonds are some of the most rare and valuable diamonds in the world. They are being displayed together for the first and only time. The diamonds range from 5.11 to 203.04 carats in weight. All are crystallized from carbon atoms deep within the Earth and endured an explosive journey to the Earth’s surface. The De Beers Millennium Star is composed purely of carbon atoms. The others were tinted rare colors as impurities and defects replaced some carbon atoms during growth.