In my spare time I went back to the filigree rings, I think it's more important that the rings at final icon size (48x48) be easy to distinguish between the silver and platinum. so I went with a slightly more blue tint for the platinum. I think this will work.
http://i48.photobucket.com/albums/f2...ree_Sample.jpg
above samples of a basic filigree ring and a filigree ring set with a gem. (I do not think it will be necessary to make another render with a 'perfectly cut' v version. Keeping it simple is the rule of my game.)
Cheers!