Rough Diam Prices (Thur, 14 Apr) - Mentioned by Will PurcellRough diamond supply is tight and will tighten further thanks to sanctions against Russia, cheer promoters and analysts alike, so why is the slide in rough prices steepening, investors ask. Paul Zimnisky's global rough diamond price index took its steepest tumble since the pandemic hit two years ago, dropping a full percentage point this week.