A profoundly curious gem is up for auction. The pear-shaped jewel called "the Enigma," cut with 55 gleaming sides, is dark and cryptic. The fine art company Sotheby's calls the unusual diamond "one of ...

Black carbonado diamonds are among the rarest gems on Earth, and a 555-carat specimen going to auction in February is especially noteworthy. As the Associated Press reports, "The Enigma" diamond is ...

Black, or carbonado, diamonds, came from outer space, geologists have discovered. If indeed “a diamond is forever,” the most primitive origins of Earth’s so-called black diamonds were in deep, ...

Black diamonds found in only a few places on Earth may have crashed down from space in a kilometre-sized rock, according to new research. The diamonds, also called carbonado, are only found in Brazil ...

Some say it's possible the carbonado diamond came from outer space (SOUNDBITE) (English) CURATOR OF MINERAL SCIENCES AT NATURAL HISTORY MUSEUM OF LOS ANGELES, AARON CELESTIAN, SAYING:"We think that ...

Last week, London auction house Sotheby’s unveiled the so-called “Enigma Diamond,” a 555.55-carat black diamond that will go up for sale next month. The plum-sized gem debuted at the Dubai Diamond ...

Pumicelike, dark, and exotic, carbonado diamonds don’t look like the gemstones on engagement rings. That’s because they may have been created by an exploding star and delivered to Earth by an asteroid ...

Boulder, Colo., USA – Six new Gesophere articles, posted online on 14 Aug. 2013, offer insight into a variety of geologic problems, from the minute to the massive. Authors investigate inclusion and ...