The size of a 2 carat diamond varies depending on its shape. For example, a 2 carat round diamond, cut to ideal proportions, measures about 8.10 mm in diameter. Other diamond shapes may have different dimensions, offering a larger or smaller surface. 2 carat princess cut diamonds measure about 7.00 mm x 7.00 mm, while emerald cut diamonds have dimensions of 8.50 mm x 6.00 mm. Asscher, radiant, cushion, oval, pear-shaped, heart-shaped, marquise and trillion cuts also have specific dimensions for a 2 carat diamond, offering a variety of choices depending on aesthetic preferences.