Alan Davies, chief executive of Rio Tinto's diamonds and minerals division, poses with a rare pink diamond in Hong Kong September 6, 2013. The Argyle Pink Diamond Tender, showcasing the finest ... more 
Alan Davies, chief executive of Rio Tinto's diamonds and minerals division, poses with a rare pink diamond in Hong Kong September 6, 2013. The Argyle Pink Diamond Tender, showcasing the finest coloured diamonds from Rio Tinto Ltd's mine in northwest Australia, opens its doors to about 100 carefully selected gem enthusiasts in Hong Kong this week. Picture taken September 6, 2013. REUTERS/Bobby Yip (CHINA - Tags: BUSINESS SOCIETY WEALTH) less 
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Reuters | Photo By BOBBY YIP / REUTERS
Mon, Sep 9, 2013 1:23 AM EDT