The biggest rough diamond ever discovered is called Cullinan. Found in 1905 by the workers of Premier Diamond Mining Company, it was as big as a man’s fist and weighed 3106 carats. Today, it would have been priced at 7.5 billion USD. Because the stone was cracked within, it was impossible to cut and polish as a whole. Instead, it was split into several parts: two large, seven medium-sized, and about a hundred small diamonds.
Another famous diamond worth noting is the Centenary diamond, found by the same mining company in the 1988. The diamond's original weight was 599 carats, but its irregular shape made processing the stone very difficult. Master gem cutters, with particular expertise in diamond cutting, were involved in the Centenary’s processing. They studied the stone for three years just to prepare for the cutting. The Centenary cutting was finished in 1991, producing a 273.8-carat diamond.
Found in 56 B.C., the Koh-i-Noor diamond is one of the most ancient diamonds known. Nowadays, it is a part of a collection stored at the Tower of London. After being cut the first time, the diamond weighed more than 600 carats. After the second cut, though, its weight was reduced to only 186.1 carats. The story of the Koh-i-Noor diamond is the story of numerous betrayals and treasons, deceptions and lies, and even bloodsheds and murders. Everyone who saw this incredible stone was willing to give his or her life to possess it. The Koh-i-Noor is extremely beautiful indeed; only a few stones have similar fineness and light play qualities.
Another famous diamond is the Orlov diamond (sometimes spelled Orloff). It is the world's third largest cut diamond. Orlov’s history began in the 17th century, when it was discovered in India. The original stone weighed 400 carats. It lost more than half its size when it was cut, finally weighing only 189.62 carats. Legend says that the stone originally belonged to Hindu priests and decorated the head of the Moon god statue kept in their temple. The god Vishnu once came to the priests and commanded them to cherish the diamond as if it was the apple of their eye. The god also said that anyone who dared to steal the stone would be doomed to disease and misfortune. It is believed that, after ruler Aurangzeba ordered the destruction of numerous Hindu temples, the Orlov diamond started to bring misfortune to its keepers. The stone was considered lost for a long time, until the 18th century. It reappeared again in the 1784 decorating the Russian emperor’s scepter, which is now kept at the Diamond Fund of the Moscow Kremlin.