Spot metal prices are priced per troy ounce. Troy ounce is the global and traditional unit of weight used for precious metals, which was attributed to a weight used in Troyes, France, in medieval times.
1 troy ounce = 31.1034768 grams
1 ounce = 28.3495231 grams
1 troy ounce contains 2.75 grams more of metal than the standard ounce
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