I'd go to Artcarve.com and check them out. We sell them in our store and I had a woman who was 68 replace hers finally after 20 some years of it missing.
I have thought about getting a class ring, but really I never got a high school ring. If I do I will probably make it myself (design it) and incorporate my schools colors...red, white and black. If I don't want that I may just choose the Chi Omega colors and have that as a class ring instead. Personally I see myself wearing a ring with my school colors than a bulky class ring
This picture is from ArtCarved.com. It's under the family rings, but it's the only petite one that I liked. I'd put my name and then graduation year on it...with a Garnet (which is my birthstone and the school colors).