You should check out origamiowl.com.
http://www.origamiowl.com
They're similar to Pandora where you buy charms to personalize the jewelry, except you buy a locket and add small charms inside of it. My wife has a couple lockets from them with a bunch of charms with unique meanings to her. Pandora is cool but I've only seen bracelets...I'd hate wearing a big bracelet all the time.