London, UK. 6 April 2018. A model presents a 51.71-carat round brilliant-cut diamond (top) and a 50.39-carat oval diamond (bottom) at a photocall at Sotheby's, New Bond Street. They are two of the largest, purest white diamonds ever to come to auction, have a combined estimate in excess of US$15m and will be sold at auction in Geneva on 15 May. Credit: Stephen Chung / Alamy Live News

- Image ID: MB27GX
London, UK.  6 April 2018. A model presents a 51.71-carat round brilliant-cut diamond (top) and a 50.39-carat oval diamond (bottom) at a photocall at Sotheby's, New Bond Street. They are two of the largest, purest white diamonds ever to come to auction, have a combined estimate in excess of US$15m and will be sold at auction in Geneva on 15 May.  Credit: Stephen Chung / Alamy Live News Stock Photo
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London, UK. 6 April 2018. A model presents a 51.71-carat round brilliant-cut diamond (top) and a 50.39-carat oval diamond (bottom) at a photocall at Sotheby's, New Bond Street. They are two of the largest, purest white diamonds ever to come to auction, have a combined estimate in excess of US$15m and will be sold at auction in Geneva on 15 May. Credit: Stephen Chung / Alamy Live News
Stephen Chung / Alamy Stock Photo
Image ID: MB27GX

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