Solitaire settings include a single diamond, allowing the brilliance of your diamond to be the focal point of your ring. Because of their timeless simplicity, solitaire rings can fit a wide range of diamond shapes and sizes. Round diamonds are the traditional choice for solitaire engagement rings, although fancy shapes such as cushion, oval, pear, radiant, and emerald cut diamonds are also popular. 3 carat solitaire diamond rings or larger look gorgeous and make an engagement ring a true statement piece, but a diamond doesn’t have to be that enormous to make an impression!