UNITED KINGDOM - NOVEMBER 27: Cubic zirconia replicas of the original and a modern Koh-i-Noor diamond are on display at the Natural History Museum's new permanent gallery ''The Vault'' in London, U.K., on Tuesday, Nov. 27, 2007. New York diamond dealer Alan Bronstein, whose gems go on show at London's Natural History Museum tomorrow, doesn't recommend colored diamonds as an investment. (Photo by Suzanne Plunkett/Bloomberg via Getty Images)
