'The Mediterranean Blue' was displayed in Abu Dhabi in April
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The 10.03-carat diamond was mined in South Africa
An exceptionally-rare blue diamond went under the hammer in Geneva late Tuesday, selling for $21.5 million, Sotheby's auction house said.
The Mediterranean Blue has an estimated value of $20 million, auctioneers say
A rare blue diamond valued at $20 million went on pre-auction display on Tuesday in Abu Dhabi, capital of the oil-rich United Arab Emirates.