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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.
The Troy Ounce is part of a larger measurement system for precious metals that is known as Troy weights. A regular Ounce is comprised of 28.35 grams. A Troy Ounce, however, is comprised of 31.1034807 grams. As you can see, there isnât much of an overall difference between the two types of Ounces, but when it comes to gold weight, that extra 2 or 3 grams affects the size of the finished product.