The quantity of grams are in an ounce of gold? Gold is always measured from the troy ounce, that is similar to about 31.103 grams. This conventional of measurement was designed in France throughout medieval periods and was later adopted by America in 1828 for standard coinage. A troy ounce https://reidzgkos.wikiconversation.com/6563710/gold_things_to_know_before_you_buy