Troy weight

Troy ounce is a traditional unit of gold  – ‌this sample marked "999,9" is four nines fine (see: Fineness § Gold), meaning it is pure to 999.9 parts in 1,000 (i.e.99.99% pure)
One troy ounce (480 grains; 31 grams) samples of germanium, iron, aluminium, rhenium and osmium. The differences in size are due to differences in density.
A Good Delivery silver bar weighing 1,000 troy ounces (about 83 troy pounds or 31 kg)

Troy weight is a system of units of mass whose origin is uncertain. By far the most common troy unit is the troy ounce (oz t), the standard mass unit for precious metals in industry and in trade; it equals 31.1034768 grams. The troy weight units 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 and apothecaries' systems, but the troy ounce is heavier than the avoirdupois ounce, and the troy pound is lighter than the avoirdupois pound.

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