Question: what is oz of gold?
Answer: What is a Troy Ounce of Gold? A troy ounce of Gold is equal to 31.10 grams. It's a unit of measure first used in the Middle Ages, originating in Troyes, France. You may notice that this is slightly heavier than the 28.35 grams we've come to expect from the standard ounce (also known as the avoirdupois ounce).