Christie's employees model The Rosebery pearl and diamond tiara, bracelet and brooch at Christie's in London June 6, 2011. The tiara is expected to sell for £1-1.5 million (US $ 1.6-2.5 million) and the bracelet and brooch, which will be sold together, are expected to earn £300,000-400,000 (US $500,000-660,000) when they are auctioned in London on June 8. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY)