The word carat (karat) comes from the Carob bean
A diamond carat is the weight measurement of a diamond, taken from Medieval French and Italian, from Arabic qīrāt, meaning “bean pod,” which is itself from Greek keration, referring to both the carob bean and a small weight. The standard unit of a “carat” is defined as 200 milligrams. Each carat is subdivided into 100 ‘points’, which enables exact measurements to the hundredth decimal place. If a diamond is below one carat, the jeweller might refer to the diamond by its ‘points’ alone.
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