The world’s largest blue diamond ever to come to auction has sold for 450,925,000 HKD, or $57.5 million. Named “The De Beers Cullinan Blue,” the massive 15.10-carat step-cut gem sold at ...

The world's largest blue diamond now has a price tag to match its rarity. The 15.10-carat diamond, called "The De Beers Cullinan Blue," sold for $57.5 million Wednesday in an auction at Sotheby's ...

Key Background. Diamond prices are rising after the industry experienced a drop in demand amid the onset of the coronavirus pandemic in 2020. Two of the world’s leading diamond companies, De ...

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.

Some research is best done behind heavy, locked doors. When geologist Jeffrey Post recently embarked on an experiment involving the Hope Diamond, at 45.52 carats, the world’s largest deep-blue diamond ...

GENEVA -- Sotheby's says a rare blue diamond has sold for a record 48.6 million Swiss francs or $48.5 million at a Geneva auction, including fees. The 12.03-carat "Blue Moon" Diamond is said to be ...

The Blue Moon — so-called in reference to its rarity, playing off the expression "once in a blue moon" — topped the previous record of $46.2 million.

A 7.59-carat round fancy vivid blue diamond is being offered as the top lot in Sotheby’s Hong Kong Magnificent Jewels and Jadeite sale scheduled for October 7 at the Hong Kong Convention and ...