The Okavango Blue Diamond, a dazzling 20.46-carat stone, is more than just a beautiful jewel-it's practically a miracle of ...

A big, beautiful diamond. Sure, it catches light like no other gem, and it's the hardest material on Earth, and it's worth an awful lot of money. But what is it really but a collection of ordinary ...

A billion-year-old black diamond, believed to be the largest cut diamond on Earth, is going up for auction. There are competing theories about the origins of the gem, named The Enigma, including ...