Gold is a precious metal. Jewelry may be the first thing that comes to many people's minds when they think of gold, but the gold in jewelry is rarely pure. It contains other alloys to make it harder. Because of gold's ability to conduct electricity, many industries make use of it. It is also a popular investment item. Though the price of gold fluctuates, many regard it as a wise investment because its value generally increases over time. Those who choose to buy gold may purchase coins, which have numismatic value in addition to the value of the metal itself. Others buy gold bars, dust...