The term 'Karat' is a unit of measurement used to describe the purity of gold and other precious metals. It is commonly used by jewelers to indicate the amount of gold present in an item. The term 'Karat' is derived from the Greek word 'keration, ' which means 'fruit of the carob tree.' A Karat is equal to 1/24th of the total weight of the metal, with 24 Karats being the purest form of gold.