Learn how to say Carats correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word carat:
1a unit of weight for precious stones and pearls, equivalent to 200 milligrams:
a half-carat diamond ring
2 (US also karat) a measure of the purity of gold, pure gold being 24 carats:
late Middle English (in sense 2): from French, from Italian carato, from Arabic qīrāṭ (a unit of weight), from Greek keration ‘fruit of the carob’ (also denoting a unit of weight), diminutive of keras ‘horn’, with reference to the elongated seed pod of the carob