Moonstone comes with a gorgeous iridescent sheen, and is seeing an upsurge in popularity in jewelry with a bohemian appeal. They're associated with lunar mystery and magic and have been used to treat insomnia, sleepwalking, ward off nightmares, and promote vivid dreams. Impressive! Not to mention, a moonstone engagement ring totally reminds us of our beloved childhood mood rings. Admit it, Here, check out our favorites in a range of cut and settings,you totally had one.