An employee poses with a diamond and emerald necklace from the Lily Safra collection during an auction preview at Christie's in Geneva May 10, 2012. The necklace is expected to sell between CHF 550,000 and 740,000 ($ 600,000-800,000) when it goes into auction May 18, 2012 in Geneva. [Photo/Agencies]

An employee poses with a ruby camellia brooch from the Lily Safra collection during an auction preview at Christie's in Geneva May 10, 2012. The brooch is expected to sell between CHF 1,100,000 and 1,400,000 ($ 1,200,000-1,500,000) when it goes into auction May 18, 2012 in Geneva. [Photo/Agencies]