The heart shaped diamond is an unmistakable and unique symbol of love. These diamonds are very popular in rings as well as solitaire pendants. Symmetry is a very important characteristic when choosing a heart, since the two halves of the heart must be identical.
The wings (the sides as they curve down to the point) should have a slightly rounded shape, and the cleft (between the two lobes) should be distinct and sharp. As the heart shape is hard to perceive in smaller diamonds, especially once they are set in prongs, heart shaped diamonds less than .50 carats are likely not a good choice.