Gorgeous beads and bangle, CR. It may still be a D if the top side is rounded and sticks out like the front side of the "D" rather than being flat like the other sides.
That is really useful info, SmokieDragon. Thanks for posting it. Interesting that AAJ mentions the mm but not the other size numbers in the sizing chart on that page, just with the descriptions of the bangles, so you putting together the sizing conversion chart is super useful. Thanks!
My most comfortable bangle is what I though a princess round but it turns out it is a "bevelled" by their description. Not completely sure what the difference is between a rounded square and beveled. Seems to me that the square is just more rounded for the bevelled shape. In general, I find I perfer bangles with steep sidies like all the profiles pictured and also like your bangle above, CR. D's that have sides that taper down I find harder to stack with other bracelets and they kind of dig into my hand after a while.