25 Jan 2019 1900-2018. In 2018, the average gold price for one troy ounce amounted around 1268.49 U.S. dollars. In 2018, a troy ounce of gold had an annual average price of around 1,268.49 U.S. dollars. Gold market Read more Historical Gold, Prices/Price 1800-2009, Market, Bullion, Ingots, Bars, History: from Finfacts Ireland. In the United States 14 carat predominates, with some 10 carat. times as heavy as the avoirdupois ounce, with which we are more familiar), the volume of its money would be reduced, leading to lower prices, while the