What is 18 Karat?

18 Karat — (18k) gold is 18 parts of gold to 6 parts other metals, such as copper, nickel, etc. The gold content of a piece of jewellery is measured in Karats, which can range from 1 to 24. 18 Karat gold is the most widely used gold to produce studded jewellery. This is so because 22 karat is too soft to set any stones.