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Diamonds: Huge, rare precious stones form 750km underground in Earth's mantle 

The world's largest,...

Diamonds: Huge, rare precious stones form 750km underground in Earth's mantle The world's largest,...

World Diamond News
Diamonds: Huge, rare precious stones form 750km underground in Earth's mantle

The world's largest, purest diamonds form in pools of molten metal in the Earth, much deeper than the majority of more common diamonds, scientists say.

The largest and rarest diamonds are made in a different way to more ordinary, smaller diamonds, according to a paper in the journal Science.

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