History of Carat WeightAnna S.
The more carats, the better.
Long time ago, merchants used carob seeds as a way of weighting gemstones. They believed that all carob seeds weighed precisely the same.
Obviously, this assumption turned out to be false. But by that time, the name «carat», traced all the way back to the Greek word for «carob seed», was deeply rooted in our laguange.
Prior to the 1500s, merchants used carat to weight gold. Then, in the 1570s, diamond and gemstone merchants adopted the measurement for stones, as well.
However, only in 1907, the Fourth General Conference on Weights and Measurements officially adopted the carat and established its weight equal to 200 mg.
Carat stands as the industry standard to this day.