Round diamonds are traditionally the first and most popular diamond that’s given as a symbol of commitment. They have a classic uniform and symmetrical shape that consists of 58 facets, which qualifies them a brilliant cut. The faceting on round cut diamonds also makes color and inclusions appear better than in other fancy shapes. In fact, these stones are so beloved that over 50% of all diamonds purchased are round cuts — you probably can’t look around without seeing a round diamond engagement ring. But what do you need to know if you’re thinking of buying a loose diamond in this shape? We break it all down, from setting choices to ideal measurements, what you should expect to pay, and more.