Karat is most commonly denoted as “K”; carat is most commonly denoted as “Ct.”

Is ct short for carat?

A carat may be divided into 100 points, each with a mass of 2 milligrams. The abbreviation for carats is CT or ct.

How do you abbreviate a carat diamond?

Diamond carat can be abbreviated as “ct” or “cw” (short for carat weight). Another abbreviation less often used is “dw,” referring to diamond carat weight. But—there is a difference between diamond carat weight and total carat weight.