Rare blue diamond gets US$21.5M at auction

The Mediterranean Blue diamond is on display during its worldwide debut in Abu Dhabi, United Arab Emirates, Tuesday, April 8, 2025. (AP Photo/Altaf Qadri) Geneva, Switzerland — An exceptionally-rare blue diamond went under the hammer in Geneva late Tuesday, selling for US$21.5 million, Sotheby's auction house said. "The Mediterranean Blue", a fancy vivid blue diamond weighing 10.3 carats with an estimated value of $20 million, attracted an intense bidding battle. Bidding began at nine million Swiss francs ($10.8 million), with a fierce back and forth before the diamond was ultimately sold to a private U.S. collector, whose name was not…