here a bit of history and also calculation of gold.. on k..
24 KARAT GOLD FACTS
24K = 100% pure gold
22K = 91.7% pure gold
14K = 58.3% pure gold
Gold has been used as money for at least 3,500 years. The shekel began circulating in the Middle East in 1500 BC. The Chinese and the Romans followed with gold coins of their own. The ducat appeared in Venice in the latter part of the 13th Century and soon became the most popular gold coin in the world. Britain had its gold florins..
In the 19th Century, gold rushes open up various parts of the world to sudden development – including Alaska, the Yukon, Nevada, California, South Africa, and Australia.
In the 1840s, British gold sovereigns and U.S. $10 gold eagle coins were both considered legal tender in Canada. The first Canadian bank notes were partly backed by gold.[/u ]