
A Christie's member of staff displays an unmounted heart-shaped D colour, Internally Flawless, Type IIa diamond weighing 56.15 carats during an auction preview in Geneva April 1, 2011. The item is expected to sell between CHF 9,000,000 and 12,000,000 ($ 9,000,000 and 12,000,000) when it goes into auction May 18, 2011 in Geneva. [Photo/Agencies]
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