Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A precious metal is a rare, naturally occurring metallic chemical element of high economic value. Historically, precious metals were important as currency but are now regarded mainly as investment and industrial commodities. The best-known precious metals are the coinage metals gold and silver. While both have industrial uses, they are better known for their uses in art, jewellery and coinage. Other precious metals include the platinum group metals: ruthenium, rhodium, palladium, osmium, iridium, and platinum, of which platinum is the most widely traded. Learn more about precious metals in the following pages.