Mysterious black diamond “Enigma” for sale

 Enigma Mysterious Black Diamond is up for sale

A mysterious black diamond called Enigma has been put up for sale.

The diamond is estimated to be a billion years old, according to the BBC. Typically, these stones are between 2.6 and 3.2 billion years old.

The gem weighs 555.55 carats and is considered extremely heavy for a diamond. Its weight corresponds to the weight of a banana.

It is noted that the origin of black diamonds is shrouded in mystery. Some researchers believe they came from outer space or formed deep underground.

The 55-faceted stone is expected to sell for £4.4m ($6m) at Sotheby&# 39;s in London.

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