The unit used in weighing gold is the troy ounce; 1 troy ounce is equivalent to 31.1 grams.
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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.
1 ounce = 28.34 grams 1 gram = 0.03 oz
1 troy oz = 31.1 grams.