Enigma Black Diamond: 555.55-Carat Gem Likely from Outer Space Now for Sale

The Enigma black diamond is a 555.5-carat gem, probably from space, being displayed and auctioned for the first time. Find out more about the record-breaking black space diamond!

Black diamond that formed more than 2.6 billion years ago goes on display for the first time

Mysterious 'Enigma' black diamond goes up for auction

Black Sapphire Gemstone: Properties, Meanings, Value & More

Black Sapphire Gemstone: Properties, Meanings, Value & More

What is a Carat And Is It Related To Karat

From outer space? 555.55-carat black diamond 'The Enigma' set for auction

The Enigma: Billion-year-old black diamond sold for £3.16m

What is a Carat And Is It Related To Karat

Sotheby's Auctioning Rare Black Diamond from Space