This is really deep, man: SA diamond came from 660km below ...

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This is really deep, man: SA diamond came from 660km below surface

The 20-carat stone is rare and incredibly valuable

Cape Town bureau chief

A diamond mined in SA was formed in Earth’s lower mantle, three times deeper than most diamonds.

The stone in question – its precise origin has not been revealed – weighed 20 carats (about 4g), and a laser aimed at tiny inclusions inside it proved they were created by bridgmanite.

This substance, which makes up about 40% of the Earth’s volume, occurs only under the extreme pressure conditions of the lower mantle, more than 660km below the surface...

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