A heart-shaped lab-grown diamond is a unique and unmistakable symbol of love. Heart-shaped lab-grown diamonds are very popular in solitaire pendants as well as rings. When choosing a heart, symmetry is a very important characteristic, since it is critical that the two halves of the heart are identical. The cleft (between the two lobes) should be sharp and distinct, and the wings (the sides as they curve down to the point) should have a very slightly rounded shape.
Heart-shaped lab-grown diamonds of less than .50 carats may not be a good choice, as the heart shape is more difficult to perceive in smaller diamonds, especially after they are set in prongs. For smaller hearts, a bezel or three-prong setting (one prong on each lobe, one prong at the point) will better preserve the heart shape outline of the diamond after it is set.