When it comes to eternity rings, there is no ârightâ amount of carats. The choice largely depends on personal preference, budget, and the overall style you're aiming for. Some individuals prefer a subtle sparkle with smaller stones totaling less than 1 carat, while others might opt for a more glamorous look with larger diamonds that can exceed 5 carats in total. The size of the diamonds, combined with the total number of carats, affects both the ringâs appearance and its price. Ultimately, the best carat size for an eternity ring is one that matches the wearer's taste and lifestyle.