True. The great thing about doing cast metalwork (most rings are cast, then finish ground/buffed) is that unless you do a really terrible job of casting, what you get out looks exactly like what you put in. So you can spend all the time you want to working on your wax piece beforehand, get it exactly how you like it, make your mold, and then cast away. Other than that, it's a matter of making sure you preheat the mold properly (and ideally have a centrifugal metal casting setup that spins the mold while you pour to force the metal into it) and bring the metal to a high enough temperature before you start pouring. IMO, it's easier to get a casting right than most other things aside from machined work... speaking of which, you could turn out a pretty badass ring with a 5 axis mill and some really fine tooling.