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Diamonds are measured in Carat Weight.
One carat weighs 200 milligrams. If a
diamond is referred to as four grains, this
also means that it is a one carat diamond.
The word Carat comes from the word carob.
A carob is a bean that grows on a tree in the
Mediterranean. In times past, if a diamond
weighed the same as a carob bean, it was
one carob, or one carat.

However, in the far east, where Carob trees
do not grow, rice was used to measure the
weight of a diamond. If a diamond weighed
as much as four grains of rice, it was four
grains