There are approximately 31.1035 grams in a troy ounce of gold. The troy ounce is commonly used in the precious metals industry, including the trading of gold and silver. This is different from the avoirdupois ounce, which is the more familiar unit of mass in everyday use, and it contains about 28.3495 grams.
When dealing with precious metals like gold and silver, it’s important to use the troy ounce to ensure accurate measurements and consistency in the market. Therefore, if someone says they have an ounce of gold, they are likely referring to a troy ounce unless otherwise specified.