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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.
Therefore the troy ounce is 480 grains (31.10 g), compared with the avoirdupois ounce, which is 437.5 grains (28.35 g). So the troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce, which is used for everyday purposes in the United States. Although troy ounces are still used to weigh gold, silver, and gemstones, troy weight is no longer used in most other applications.