A 2-carat diamond is approximately 8.2 millimeters in diameter. The exact size of a 2-carat diamond can vary slightly depending on its shape, as different shapes distribute their weight differently. However, in a round brilliant cut, which is the most popular shape for diamonds, a 2-carat diamond typically has a diameter of about 8.2 mm.

The size of a diamond is measured in carats, which is a unit of weight, not size. Carat weight is one of the “Four Cs” used to describe a diamond’s quality, with the other factors being cut, color, and clarity. While carat weight is an essential consideration, a diamond’s visual appearance and overall value are also influenced by these other factors.