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Troy Weight

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Troy weight is a system of units of mass used for precious metals.

  • 1 ounce Troy = 20 pennyweights = 480 grains = 31.103 grams
  • 1 pennyweight = 24 grains
  • 1 carat (used when weighing diamonds) = 3.086 grains = 200 mg = 0.2 10-3 kg = 1/5000 kg
  • 1 grain Troy = 1 grain avoirdupois = 1 grain apothecaries' weight = 0.0648 gram
  • 1.0000 lb = 14.5833 Troy Oz = 453.5917 grams

Note that a carat is a unit of weight used to measure the size of gemstones like diamonds. A karat is a measurement indicating the proportion of gold in an alloy.

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