Three stone rings or Trilogy rings are a true classic and very traditional. The main style of these rings is that they craft with the center main stone and two stones on the side. The Three-stone ring symbolizes the love that contains the past, present, and future. That's why it is also known as a promise ring. The easy and graceful three-stone rings can add more glimmer to your outfit. If you want to add beauty and style to your closet, you must have a stunning stackable sterling silver ring.