Every woman dreams of receiving a huge priceless diamond. Now space scientists【C1】______that they have discovered the largest diamond in the universe. But it's well【C2】______the reach of the most lovestruck men because it's 50 light years away, to be【C3】______. Measuring 2,500 miles across and weighing five million trillion trillion pounds, the rock was found on Valentine's Day【C4】______ in the core of a white dwarf star, and it has excited the【C5】______world. 'It's the mother of all diamonds, 'said Travis Metcalfe,【C6】______led the team of researchers at the Harvard-Smithsonian Centre ,' and you would need a jeweler's loupe(用专放大镜), the size of the Sun, to 【C7】______ this diamond.' The largest diamond【C8】______on earth was the 3,106-carat(克拉) Cullinan. It was cut 【C9】______ nine major stones, including the 530-carat Star of Africa, now a part of the Crown Jewels. Diamonds were【C10】______ discovered in India more than 2,800 years ago. The Ancient Romans【C11】______that the stones were broken pieces of stars that had【C12】______to earth. In Ancient Egypt, diamonds were used in funerals. In the Middle Ages, men【C13】______them to symbolize their courage and strength. The 【C14】______of giving them as presents dates from 1477,【C15】______Maximilian, the prince of Austria, gave a diamond ring to Mary of Burgundy. 【C1】