Crystallographic orientations of olivine inclusions in diamonds

In this work we report for the first time the crystallographic orientations of olivine inclusions trapped in diamonds from the Kaapvaal craton (South Africa) determined by single-crystal X-ray diffraction, and analyze them together with all available data in the literature. The overall data set indicates no preferred orientation of the olivine inclusions with respect to their diamond hosts. However, diamonds containing multiple olivine inclusions sometimes showclusters of olivineswith the same orientation in the same diamond host.Weconclude that such clusters can only be interpreted as the remnants of single olivine crystals pre-dating the growth of the host diamonds.