image: Examples of rough CLIPPIR diamonds from the Letseng mine, Lesotho. This material relates to a paper that appeared in the Dec. 16, 2016, issue of Science, published by AAAS. The paper, by E.M Smith at Gemological Institute of America in New York, N.Y., and colleagues was titled, "Large gem diamonds from metallic liquid in Earth's deep mantle." view more
Credit: GIA copyright, credit Robert Weldon and Gem Diamonds Ltd.