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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.
Troy weight is a system of units of mass customarily used for precious metals and gemstones. There are 12 troy ounces per troy pound, (373.24 g) rather than the 16 ounces per pound (453.59 g) found in the more common avoirdupois system.The troy ounce is 480 grains, compared with the avoirdupois ounce, which is 437 1â2 grains.Both systems use the same grain defined by the international yard and pound agreement of 1959 as exactly 0.064 798 91 gram.he troy ounce is 480 grains, compared with the avoirdupois ounce, which is 437 1â2 grains. Both systems use the same grain defined by the international yard and pound agreement of 1959 as exactly 0.064 798 91 gram.