The “Bleu Royal” diamond set upon a ring went under the hammer for $43.8 million (CHF 39,505,000) at Christie’s auction in Geneva on Tuesday, the Associated Press, CBS News and Reuters reported.

The largest internally flawless fancy vivid blue diamond ever put up for auction sold for a staggering $43.8 million at a Christie's sale of rare jewels in Geneva on Tuesday, the auctioneer said.

The vivid blue diamond, known as “Bleu Royal” and set in a ring, is among the rarest ever to be unearthed. At 17.6 carats, the diamond had an estimated value of up to $50 million prior to the ...