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| Avoir dupois weights
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| The system of masses used in the United States for most common commercial purposes based on the pound and ounce.
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| Troy weights
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| A system of mass units use to measure precious metals. While there are 16 avoirdupois ounces in one avoirdupois pound, there are only 12 troy ounces in one troy pound. Grams as well as grains are equal under both systems.
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| Conversions
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| 1 gram = 15.43 grains
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| 1 ounce troy = 31.103 grams = 480 grains = 1.097 avoirdupois ounces
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| 1 ounce avoir dupois = 28.349 grams = 437.50 grains = .911 troy ounces
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| Sterling vs. Fine silver
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| The two most common forms of silver are Sterling and Fine Silver. Sterling silver is 92.5% pure and fine silver is 99.9% pure. One troy ounce of fine silver weighs 480 grains. One troy ounce of sterling (.925) silver also weighs 480 grains, but only contains .925 troy ounces of fine (.999) silver. Conversely, 1.04 oz of sterling silver contains 1 troy oz of pure silver. Frequently, Sterling silver coins or bars are weighted to yield a full ounce of .999 silver - they weigh 1.04 troy oz to make up the difference.
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