An employee poses with a pear shaped diamond and tourmaline poppy 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 460,000 and 650,000 ($500,000-700,000) when it goes into auction May 18, 2012 in Geneva. [Photo/Agencies]

An employee poses with a rectangular cut diamond ring, an oval shaped ruby and diamond ring and a rectangular cut sapphire and diamond ring from the Lily Safra collection during an auction preview at Christie's in Geneva May 10, 2012. The diamond ring is expected to sell between CHF 3,300,000 and 4,600,000 ($3,600,000-5,000,000), the sapphire ring between CHF 420,000 and 500,000 ($450,000-550,000) and the ruby ring between CHF 2,800,000 and 4,600,000 ($3,000,000-5,000,000) when they go into auction May 18, 2012 in Geneva. [Photo/Agencies]