IOSSELLIANI never fails to impress--stacking rings just looks so cool in every way possible. Most of their pieces are done in silver, however if you're like me and will only wear solid yellow/white gold, you sort of have to hunt them down. Found the above three different stacks at Honey in the Rough, a boutique in the Lower East side of Manhattan. All these rings are 18k yellow or white gold, with real gemstones and river pearls--no faking it here!