Gold is the oldest precious metal known to man and for thousands of years it has been valued as a global currency, a commodity, an investment and simply an object of beauty.
Gold purity is measured in terms of karat and fineness:
Karat: pure gold is defined as 24 karat
Fineness: parts per thousand Thus, 18 karat = 18/24 of 1,000 parts = 750 fineness