WHAT IS A CARAT?
The word CARAT name two different units:
- Weight of gemstones
- Purity of precious metals
CARAT comes from the ancient Greek word Keration. It means carob tree, because the carob beans were used in antiquity to weigh jewels and gemstones.
- One carat used as a weight unit is equal to 0.2g (0.007oz)
- One carat used as a purity unit is equal to 1/24 part of precious metal. In a 18 carat gold jewel there are 18 parts of gold of every 24 alloy parts.
It means that 24 carat gold is pure gold.
Nowadays, the rule that orders the metal law is expressed in thousandths. So legally, the 18 carat gold, should call 750ml gold (0.03oz gold).