(18 May 2016) FOR CLEAN VERSION SEE STORY NUMBER: 4036049
One of the world's most expensive diamonds is set to go on sale at a Christie's auction in Geneva on Wednesday.
The so-called Oppenheimer Blue diamond, 14- and-a-half carats in size, is expected to sell for around 40 million US dollars.
It's said to be the largest and best-quality fancy vivid blue diamond in existence.
The stone was formerly owned by diamond magnate and owner of De Beers, Sir Philip Oppenheimer.
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