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A model displays the 'Pink Star' 59.60 carat oval cut pink diamond at Sotheby's in Geneva September 25, 2013. REUTERS/Ruben Sprich

Rare pink diamond goes on show

The 'Pink Star', a 59.60 carat oval cut pink diamond,will become the most expensive diamond ever when it goes into auction next November 13, with an asking price of $60 million.