I know this sounds ridiculous, but I am choosing between a D IF 2.32 and a F IF 2.52. The D stone sparkles slightly more, possibly because the polish is "excellent" and on the F stone it is only "very good." As far as I know, it is very difficult to determine what cut is better for all Tiffany Lucidas as I haven''t seen any published data on the "ideal" cut for a Lucida. In any event, the D stone is significantly more money, but I really want the perfect stone. Also, the F stone has a very small culet, while the D stone has none. The upshot is that the D sparkles more, but the F looks bigger, so I''m torn. I know you''re not supposed to be able to tell between D and F, but everyone who has compared both stones can say that the D sparkles more. It may have to do with the cut of that stone. My ring size is 4 1/2, so I''m thinking that the 2.32 doesn''t look too small, but the 2.52 looks pretty large. I know both of these rings are awesome, but I''m thinking I should go with the one that sparkles more.