How big is a carat diamond?

One-carat round diamond has a diameter of 6.49 mm and a mass of 0.2 g.

The following figure shows the comparison table of the weight (carat) and waist diameter (millimeter) of standard round diamonds, which can be used to inquire the diameters of diamonds of different qualities.

Diamonds come in different shapes and sizes. A one-carat round diamond has a diameter of 6.49 mm, while the Princess Square diamond has a diameter of 5.5 mm.. Other shapes and diameters of a carat diamond are: emerald 5 mm, pear 5.5 mm, oval 6.5 mm, heart 6.5 mm, olive tip 5.5 mm and ruby 4.75 mm.

The following figure shows the contrast between the object and the hand (1ct = 1ct).

Physical comparison of 1 carat diamond

1 carat diamond finger wearing effect