Did you know that,

The Ancient Greeks discovered that the seeds of the

carob (Carob, Ceratonia siligua) always have the same weight (about 0.20 g) and that's why they used it to measure the weight of precious metals ..

The negotiations were with the Arabs who heard from the Greeks the word (wooden horns) carats (carats) The well-known carats of gold ..

The word karat first entered the English language in the mid-15th Century. It derived from the French word carat which in turn came from the Italian carato.

The word almost certainly derives from the Arabic qīrāṭ which came from the Greek kerátion meaning Carob seed.

In Greek and Roman times it was used as a unit of weight