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What is a Troy Ounce?

  A troy ounce is a weighting unit for precious metals that has been used since the Middle Ages. One troy ounce weighs 31.1034768 grammes and was first used in Troyes, France, according to the U.K. Royal Mint. A standard ounce weighs slightly less, 28.35 grammes, and is used to measure things like sugar and grain. To…