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Geologists studied these scraps of diamond leftover from the shaping of big jewels. Evan Smith/Gemological Institute of America hide caption

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Evan Smith/Gemological Institute of America

Big Diamonds Bring Scientists A Message From Superdeep Earth

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Shinichi Kuramoto of the Center for Deep Earth Exploration in Japan displays a replica of earthquake fault rock. TOSHIFUMI KITAMURA/AFP/Getty Images hide caption

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TOSHIFUMI KITAMURA/AFP/Getty Images