The Troy System is a method of measuring precious metals, particularly gold and silver, based on a specific weight system. It originated in the 14th century and is still used today in the trading and valuation of these metals. One troy ounce is equivalent to approximately 31.1 grams, and the system is distinct from the more common avoirdupois system used for most other goods. The name "Troy" is believed to come from the city of Troyes in France, where the system was first used in trade. The troy pound, which consists of 12 troy ounces, is also part of this system. The Troy System is essential for jewelers, investors, and traders in the precious metals market.