Diamond carat, often confused with gold purity's "karat," is a crucial factor in gemstone an diamond weight measurements. One carat equals 200 milligrams and can be divided into points, with each point equal to 0.02 milligrams. The term "carat" originates from the Greek word for the carob tree (kertion), once used for weighing metals and gems. Standardisation began in 1913 in the U.S., followed by Europe and other major economies by the 1930s. Today, carat is a universal measurement in the diamond industry.