A troy ounce is a specialized unit of weight used primarily for measuring precious metals such as gold, silver, platinum, and palladium. Weighing 31.1035 grams, it is slightly heavier than the ...

Precious metals are generally measured in troy ounces, rather than standard ones. (John Taggart for WSJ) Gold futures settled Tuesday at $4,138.70 a troy ounce, the special unit of weight used for ...