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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.
Grams Per Troy Ounce. An ancient system of weights. The troy ounce belongs to the Troy weight system, which contains troy ounce, troy pound, drams and scruples. The troy pound is not often used, but the troy ounce is the common way of reporting the prices of precious metals.