For my K frames, and J frames, I have both the earlier diamonds, as well as the later 60's and 70's checkered non diamond stocks, in both round and square butt. I guess these are "magnas"? It seems like the diamonds in both frame sizes have a fuller, more "rounded" feel, where the later checkered non diamonds feel a little flatter, possibly slimmer. Is it just me, or are the diamonds a little fuller feeling in the hand?
Maybe I can round up a set of calipers and measure the thickness at the screw hole area of both styles. I dont know, but the K diamond square butts on my model 10 feel absolutely perfect for my hand size. To me, the good old fashioned S&W diamond stocks are some of the best feeling, and best looking stocks I've ran across. Great feel, beautiful, but not overstated.
Josh P .... i'll try to get a pic of them on the gun soon