A Troy Weight is a system of units of mass customarily used for precious metals and gemstones (formerly also for bread, grain, etc.): 24 grains = 1 pennyweight (1.555 grams); 20 pennyweights = 1 ounce (31.103 grams); 12 ounces = 1 troy pound (0.373 kilogram).
Related Definitions in the Project: The Property and Unit
