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A troy ounce is a unit of measure that is primarily used for weighing precious metals such as gold, silver, and platinum. The specific weight of a troy ounce is approximately 31.1 grams. To convert this to ounces as commonly used in the U.S. system (which is known as an avoirdupois ounce), it's important to note that a troy ounce is distinct from the more common ounce used for other goods.

The key difference lies in the fact that there are 16 avoirdupois ounces in a pound, while there are only 12 troy ounces in a troy pound. This unique measurement system makes the troy ounce heavier than the standard ounce.

Hence, understanding that there are about 31.1 grams in a troy ounce is crucial, especially when dealing with transactions in the precious metals market. This information ensures that measurements are accurate and consistent, which is vital for both buyers and sellers. Therefore, recognizing that the correct answer is around this figure clarifies the significance of the troy ounce in commerce and trade.