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Photo Gallery: Gems

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The world famous Koh-i-noor diamond accentuates the grandeur of the crown of Britain's Queen Elizabeth, the Queen Mother. The platinum crown includes other precious gems, and when the Queen Mother died in 2002 the crown was removed from the Tower of London and paraded through London streets. The Koh-i-noor's earliest mention occurs in Sanskrit writings. Photograph by Tim Graham/Alamy

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