LONDON.- An auction house worker poses for the photographers in central London holding a 34.05 carat rectangular-cut diamond ring, estimated to fetch some US$3.6-5 million in an upcoming auction. Christies auction house will hold the Jewels For Hope: The Collection of Mrs. Lily Safra sale in Geneva, Switzerland on May 14, 2012. The overall estimate for the collection is in excess of $US20 million. AP Photo/Lefteris Pitarakis.