View our Selection of Unique Classic Engagement Rings with a Round Cut Diamond. Each is made to order for you by its designer. Classic-style pieces are aspirational silhouettes evoking time-honored tradition and displaying painstaking craftsmanship. Each fine detail is simple and perfect in its form. Round brilliant cut is the culmination of 300 years of artistic achievement. Its design is the most symmetrical of any cut, producing the ultimate light return and beauty.