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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.
About 31.1 grams in one troy ounce. The troy ounce (exactly 31,103 476 8 g) is a non-SI unit used now only for noble metals. The other common ounce, also a non-SI unit, is avoirdupois ounce equivalent to 28,349 523 125 g.