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The unit used in weighing gold is the troy ounce; 1 troy ounce is equivalent to 31.1 grams.
31.1034768 grams exactly.Gold is measured in troy ounce( and not inavoirdupois ounce( which is 28.3495 gm).
There are 28 grams in an ounce.
One troy ounce of gold = about 31.1 grams.
Gold is sold buy the TROY ounce. The troy ounce has 31.225....grams. When people say 28 grams is the weight of an ounce it refers to standard weight.