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The troy ounce (oz t) is a unit of imperial measure, now commonly only used for the mass (weight, in common parlance) of precious metals. One troy ounce is now defined as exactly 31.1034768 g. The troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce which equals 28.349523125 g.
How many grams are in an ounce of gold? The unit of measurement for gold is troy ounces, not regular ounces, and one gram is equal to 0.03215 troy ounces. Dividing both sides of this equation by 0.03215 finds that there are 31.1 grams in one troy ounce of gold.