A Christie's employee displays a colourless diamond of 101.27 carats on February 19, 2008 in London, England. Estimated to sell for a minimum of $6 million, this rare gem is the largest to appear on the auction market in 18 years and will be offered for sale at Christie's forthcoming Spring Hong Kong jewellery sale on May 28, 2008. By Peter Macdiarmid/Getty.
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