Units & Weight

The avoirdupois ounce (av. oz) is the mass unit commonly used in everyday Anglo-American life, equal to exactly 28.349523125 grams, and therefore differs markedly from the troy ounce used in the precious metals trade at 31.1035 grams.

Carat (abbreviation kt or ct) is the traditional unit of measurement for the gold content of an alloy: 24 carat corresponds to pure gold (999‰ fineness, highest trading purity 999.9‰).

The metric carat (ct) is the legal unit of weight for diamonds and other gemstones and equals exactly 0.2 grams.

Fine weight indicates the actual amount of pure precious metal in a bar, coin or piece of jewellery – regardless of the total weight of the object.

The grain (abbreviation: gr) is the smallest unit of the troy weight system and is exactly equal to 0.06479891 grams.

The gram (unit symbol g) is the base unit of mass in the International System of Units (SI) and the most widely used weight unit in the precious metals trade worldwide.

The gross weight is the total weight of a precious metal item including all alloying components, before deducting impurities or additives.

A kilo bar is a standardised precious-metal bar weighing exactly 1,000 grams (1 kg), produced for gold, silver and other precious metals in cast or minted form.

Japanese unit of weight from the traditional shakkanho system, used today mainly in the pearl trade, equal to exactly 3.75 grams.

The troy ounce is the international standard unit for precious-metal prices and equals exactly 31.1034768 grams.

The pennyweight (dwt) is a unit of weight in the troy system that equals 1/20 of a troy ounce and is used above all in the Anglo-American jewellery and goldsmithing trade.

Per mille (‰) states the fineness of a precious metal as a thousandths share of the total mass and is the legally binding designation on bars and coins.

The tael is a traditional East Asian unit of weight for precious metals, whose exact weight varies by region between roughly 37.4 g and 37.8 g.

The tola is a traditional South Asian unit of weight for gold and silver, equal to exactly 11.6638 grams and widespread above all in India, Pakistan and the Gulf markets.

The standard weight unit used worldwide in precious metals trading: one troy ounce equals exactly 31.1034768 grams of pure precious metal.

The troy weight system is the internationally binding system of measures for precious metals, whose base unit is the troy ounce of exactly 31.1034768 grams.