This day in history

25 January - World's largest diamond found

On this day in 1905, at the Premier Mine in Pretoria, South Africa, a 3,106-carat diamond is discovered during a routine inspection by the mine's superintendent. Weighing 1.33 pounds, and christened the "Cullinan," it was the largest diamond ever found.

Frederick Wells was 18 feet below the earth's surface when he spotted a flash of starlight embedded in the wall just above him. His discovery was presented that same afternoon to Sir Thomas Cullinan, who owned the mine. Cullinan then sold the diamond to the Transvaal provincial government, which presented the stone to Britain's King Edward VII as a birthday gift. Worried that the diamond might be stolen in transit from Africa to London, Edward arranged to send a phony diamond aboard a steamer ship loaded with detectives as a diversionary tactic. While the decoy slowly made its way from Africa on the ship, the Cullinan was sent to England in a plain box.

Edward entrusted the cutting of the Cullinan to Joseph Asscher, head of the Asscher Diamond Company of Amsterdam. Asscher, who had cut the famous Excelsior Diamond, a 971-carat diamond found in 1893, studied the stone for six months before attempting the cut. On his first attempt, the steel blade broke, with no effect on the diamond. On the second attempt, the diamond shattered exactly as planned; Asscher then fainted from nervous exhaustion.

The Cullinan was later cut into nine large stones and about 100 smaller ones, valued at millions of dollars all told. The largest stone is called the "Star of Africa I," or "Cullinan I," and at 530 carats, it is the largest-cut fine-quality colorless diamond in the world. The second largest stone, the "Star of Africa II" or "Cullinan II," is 317 carats. Both of these stones, as well as the "Cullinan III," are on display in the Tower of London with Britain's other crown jewels; the Cullinan I is mounted in the British Sovereign's Royal Scepter, while the Cullinan II sits in the Imperial State Crown.

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