The troy ounce (31.1035 g) is the standard unit for weighing precious metals — gold, silver, platinum, and palladium. It differs from the avoirdupois ounce (28.3495 g) used for everyday items.
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Pro Tip
Always confirm whether a gold price quote uses troy ounces (almost always) or grams — mixing them up is an expensive mistake.
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Did You Know?
The troy system dates from the Champagne fairs in Troyes, France during the Middle Ages — a major medieval trading hub.
References
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