© Licensed to London News Pictures. 15/03/2016. A Sotheby's employee holds for sale from an Asian private collection, 'De Beers Millennium Jewel 4', a rare and superb Oval Internally Flawless Fancy Vivid Blue Diamond weighing 10.10 carats (Est.£21-25 million). It is one of twelve rare diamonds - eleven blue and one colourless - that form the world-renowned De Beers Millennium Jewels collection unveiled in 2000 in celebration of the millennium.  At 10.10 carats, it is the largest oval fancy vivid blue diamond ever to appear at auction.<br />
London, UK. Photo credit: Ray Tang/LNP