Rings look better in multiples, you can never have too many, these stackables can be worn alone or together, it doesn't get much better than that!
Frozen Fjord, JesseDanger
Gold Filled and Sterling Silver Stackable Rings, SecretCharm
Peridot, Tourmaline and Blue Topaz, BlackLotusDesign
Time out Sterling and Stones Stacking Ring Set, artisanlook