Black Diamond

<!-- -->Black diamonds are usually found close to the Earth's surface, suggesting extraterrestrial origins.London: "The Enigma", the world's largest known cut diamond at 555 carats, went under the hammer in London on Wednesday for…

Auction house Sotheby’s Dubai has unveiled a diamond that’s literally from out of this world. Sotheby’s calls the 555.55-carat black diamond — believed to have come from outer space — “The Enigma." The rare gem was shown off on…

The diamond is believed to have been created when a meteorite or an asteroid hit the Earth more than 2.6 billion years ago, according to Sotheby's auction house jewellery specialist Sophie…