In the sixties and seventies, rings like this used to be called cocktail rings, because they were larger than those typically worn in daily life, and lent themselves to evening attire and martinis. Think Mad Men.

But I can see wearing this for more than special occasions; the lovely colour of the stones (and I love rose gold) make it a cheerful addition to a jewellery wardrobe.  Made with 18 kt rose gold ring with amethyst, rhodolite and diamonds; see the Casato web site for more information.