Troy weight

Troy weight is a system of units of mass that originated in 15th-century England, and is primarily used in the precious metals industry.[1] The Troy weights are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces). The troy grain is equal to the grain-unit of the avoirdupois system, yet the troy ounce is heavier than the avoirdupois ounce, and the troy pound is lighter than the avoirdupois pound.

Troy ounce is a traditional unit of gold weight.
1 troy ounce (1.097 avoirdupois ounces, 31.1 g) coin example (Platinum Eagle)
One troy ounce (1.1 oz; 31 g) samples of germanium, iron, aluminium, rhenium and osmium
A Good Delivery silver bar weighing 1,000 troy ounces (69 lb; 31 kg)

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