Graham Pearson, University of Alberta (IMAGE) University of Alberta Caption Graham Pearson holds a diamond that contains the water-rich mineral "ringwoodite," a new discovery that yields new clues about the presence of large amounts of water deep beneath the Earth. Credit Richard Siemens/University of Alberta Usage Restrictions Include credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.