One troy ounce of gold is equivalent to approximately 31.1035 grams. The troy ounce is commonly used in the precious metals market for measuring gold, silver, and other precious metals. It is different from the avoirdupois ounce, which is used for most other goods and materials and contains about 28.3495 grams. When discussing gold, it’s essential to specify whether you are referring to troy ounces or avoirdupois ounces, as the difference in weight can impact the value and pricing.