Don't get confused when buying, selling or weighing gold or silver: The type of ounce used is the troy ounce, not the avoirdupois ounce. An "ordinary" (Avoirdupois) Ounce is exactly 28.349523125 grams - or 437.5 grains.
A Troy Ounce is exactly 31.1034768 grams - or 480 grains. Info source: Troy Ounce
A Troy Ounce is exactly 31.1034768 grams - or 480 grains. Info source: Troy Ounce
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