The investment information company, Casey Research, gives the price of one troy ounce of gold as well as the change in price by the minute on its website. Other companies that provide the price of gold are J. M. Bullion and Hard Assets Alliance.
The price may also be found on any stock trading website along with the price's fluctuation over time. As a traded commodity, the price of gold is heavily influenced by market forces.
Troy ounces are used to measure the mass of precious metals. One troy ounce is exactly 31.1034768 grams. The troy ounce differs from the avoirdupois ounce, which is 28.349523125 grams.