The carat weight
The carat is a unit of weight. It originates from the orient, where, in ancient times people used carob seeds to weigh precious stones.
The princess diamond is relatively recent. It is square-cut on top and brilliant-cut underneath.
Regions of the world with diamond mines are: Africa, Australia, Russia and Canada. The main cities in which diamonds are cut are: Antwerp, New York, Tel-Aviv, Bombay and cities in China.
Diamonds are the hardest stone in the world, only a diamond can scratch a diamond. It also the best thermal conductor.