epa05623951 A model displays the "Sky Blue Diamond", a fancy vivid blue 8.01 carat jewel of imperial russian heritage during a Sotheby's press preview in Geneva, Switzerland, 09 November 2016. The diamond is expected to realise 15-25 million US dollars when it goes for auction in Geneva on November 16.  EPA/JEAN-CHRISTOPHE BOTT

“Diamond Sky Blue”venduto per 17.1 milioni a Ginevra