Friday, Nov 17 2017 | Updated at 03:58 PM EST

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Giant, exceptionally rare diamonds are born in liquid metal deep in the Earth’s mantle

Huge and rare diamonds form extremely deep below the surface of the Earth, scientists have found. The largest stones form depths below 250Km – more than twice as deep as smaller diamonds. At these depths the diamonds form in areas saturated with liquid metal, traces of which scientists have observed trapped in the waste offcuts of the world’s biggest diamonds when they are sent to be cut.

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