A 3-carat oval engagement ring is one of the most popular carat sizes and shapes for an engagement ring. This shape with a 3-carat size will definitely get you a loving “Yes!” from your girlfriend for its bold sparkling ability. The brilliance and fire of an oval diamond is as good as round shapes due to its light-reflecting capacity. A 3-carat oval engagement ring looks absolutely stunning in delicate vintage settings, adding to its romantic beauty.