Its always easy to tell the players who come from playing on Valleys, they fire everything towards the pocket
(and rail) at warp speed then watch the ball rattle on Diamonds. I even told a weaker player during our match that usually you make more balls on a Diamond hitting them a little softer than you might on a Valley, he continued to fire at the pockets using break speed for some reason. Its not a Diamond thing, its more of a current tighter pocket thing, my 4 3/8" GCI plays very similar to a Diamond, hit the adjacent rail on the way to a pocket with pace and the ball is likely to rattle. The spin that the object ball picks up from contacting the adjacent rail is trying to spin the object ball out of the jaws, its just a good idea to aim for the opposite facing rather than the adjacent rail.