Updated: Sep 1, 2019
There was a time, when in order to weigh anything you needed a standard unit of known weight in your possession. Believe it or not, carob seeds used to fill this role. The modern unit of weight for gemstones, the word carat, owes its derivation to the same pathway that named the carob, which was originally used by jewellers to weigh their precious metals and stones. You can see the resemblance in its Greek name keration and its Latin name Ceratonia.