CLIPPIR diamonds (image) Carnegie Institution for Science Share Print E-Mail Caption Examples of rough CLIPPIR diamonds from the Letseng mine, Lesotho. These are the same kinds of diamonds as the ones analyzed in this study. Largest stone is 91.07 carats. Credit Photo by Robert Weldon; © GIA; courtesy of Gem Diamonds Ltd. Usage Restrictions WIth credit Share Print E-Mail 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.