Ceratonia siliqua harubh. "Ceratonia siliqua", the scientific name of the carob tree, derives from the Greek "kerátiοn" κεράτιον 'fruit of the carob (from "keras" κέρας 'horn'), and Latin "siliqua" 'pod, carob'. The unit "carat", used for weighing precious metal and stones, also comes from κεράτιον, as alluding to an ancient practice of weighing gold and gemstones against the seeds of the carob tree by people in the Middle East. The system was eventually standardized, and one carat was fixed at 0.2 grams. In late Roman times, the pure gold coin known as the "solidus" weighed 24 carat seeds (about 4.5 grams). As
Carat (mass) different locations. In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g). The ANSI X.12 EDI standard abbreviation for the carat is CD. First attested in English in the mid-15th century, the word "carat" comes from Italian "carato", which comes from Arabic "qīrāṭ" قيراط, in turn borrowed from Greek "kerátion" κεράτιον 'carob seed', a diminutive of "keras" 'horn'. It was a unit of weight, though unlikely to have been used to measure gold in classical times. Carob seeds have been used throughout history to measure jewelry, because it was believed that there was