The mysterious gem is believed to have come from outer space and could fetch around £4.4m when an online auction at Sotheby's ends next week.
The 555.55 carat black diamond has belonged to its current owner for two decades but little is known about its history before that.
There are competing theories about the origins of the gem, named The Enigma, including that it came from space. The rock is expected to fetch over £4.4 m at a Sotheby's auction in London by the time online bidding closes next week.Black diamonds are usually about 2.6 to 3.2 billion years old - a time before dinosaurs existed.Carbonados are extremely rare and have only ever been discovered in Brazil and the Central African Republic.
Aaron Celestian, a geologist at the Natural History Museum of Los Angeles, said that carbonados "could have formed super deep within the Earth's interior, far deeper than what we know already of diamonds.
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