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What is the Koh-i-noor diamond?

The Koh-i-noor is a 105.6-carat diamond famous for its size and disputed ownership. Part of the British crown jewels since 1849, the Koh-i-noor is claimed by several countries, including India, which has demanded its return. The diamond originally weighed 191 carats, but it was recut to enhance its fire and brilliance in 1852 by Garrard of London, the royal jeweler.