Definitions for "Troy Ounce"
Based on the ancient unit of measure, the grain, and used to measure gold. The troy ounce contains 480 grains, while the avoirdupois ounce contains 437.5 grains. Therefore, a troy ounce equals 1.097 avoirdupois ounces. Also, a troy ounce equals 20 pennyweight (DWT).
Unit of measurement dating back to the Middle Ages. 1 Troy Ounce is equivalent to 31.1034807 grams.
Weight designation for precious metals, silver, gold and platinum 14.583 Tr.Oz per pound