Which does not refer to jewelry, karat, carat or carrot? A carat is a unit of weight used to describe diamonds and other precious gemstones. Karat on the other hand, is a measure of purity when referring to gold. And the correct answer is…. Carrot, which is the linear orange colored root that we eat as a vegetable. 🥕 🥕 Visit us in Afton Village or our website www.grimsleysjewelry.com and “like” us on Facebook!