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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.
Solving the world's problems. . . one answer at a time. Gold is measured in troy ounces. One troy ounce is exactly 31.1034768 grams. This makes the troy ounce larger than the avoirdupois ounce, which has a mass of 28.35 grams.any professionals and websites don't even specify the troy p â¦ art of the term. However, when we say an ounce of gold, we mean a troy ounce. A troy ounce comprises 31.1 grams (unlike a conventional ounce, which is 28.35 grams) and 20 pennyweights.