A member of staff at Sotheby's unveils a 100-carat perfect diamond in a classic Emerald-cut, and internally flawless, at Sotheby's, London, UK on 13th February 2015. Due to be auctioned at Sotheby's Magnificent Jewels Auction in New York on 21st April 2015, where it's estimated to sell for US$19-25 million.
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