The largest diamonds ever mined on earth aren’t just set apart by their large size and luster, but by a unique origin story as well. They were born of metal, growing from patches of liquid iron and gas deep inside the Earth. That’s the conclusion formed in a study published in Science on Thursday, written by Evan Smith of the Gemological Institute of America. Most diamonds form somewhere between 150 and 200 km [93 and 124 miles] deep in the Earth.
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