If the proposal ring is to be worn parallel to the wedding ring, then both rings should be matched. If the rings are worn on different hands, then different styles and accents can be set. If the engagement ring is worn as a front ring to the wedding ring, many things are possible. Even more than you think: A classic engagement ring with a diamond fits almost everything, but a mix of materials can also be exciting. Another option would be to wear the engagement ring as a pendant on a necklace around your neck.