A rare blue diamond was on display Tuesday at an exhibition of $100 million worth of the world’s rarest diamonds in the United Arab Emirates’ capital, Abu Dhabi.

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 ...

The De Beers Blue, the largest vivid blue diamond ever to appear at auction, fetched more than $57.4 million and approximately $3.8 million per carat, making it one of the highest prices ever ...

One of the most valuable blue diamonds to ever feature at an auction could sell for more than $48 million, according to Sotheby’s.

On Tuesday, Botswana premiered a blue diamond that could outstrip the storied Hope Diamond: the 20.46-carat, close-to-flawless Okavango Blue.

Rare 20-carat blue diamond unveiled in Botswana Blue diamonds are very rare, comprising only about 0.02% of mined diamonds.

Blue diamonds are very rare as they are produced by the random presence of the atomic lattice bound trace element boron within the stones’ carbon structure during their formation.

Where blue diamonds come from is a question that’s eluded scientists for centuries. But now, secrets of the scarcest stones in the world are coming to the surface.

Blue diamonds are among the most rare and valuable gems on Earth, but up until now, scientists knew very little about them.

The Hope Diamond, a rare blue diamond that is one of the world's most famous jewels, has had a complicated history, passing through the hands of monarchs and bankers and heiresses and thieves ...

Blue diamonds come from ocean floor that is pushed nearly to Earth’s core The Hope Diamond is rare evidence that the Earth recycles.

Blue diamonds are extraordinarily rare, but the records they set at auction are not. In November 2015 the Blue Moon diamond—a 12-carat Internally Flawless Fancy Vivid Blue gem—shattered a ...