Units & Weight

Weighing exactly 28.349523125 grams, the avoirdupois ounce (av. oz) is the everyday mass unit of the Anglo-American world — and it sits noticeably below the 31.1035-gram troy ounce that governs the precious-metals trade.

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 corresponds exactly to 0.2 grams.

The fine weight states the amount of pure precious metal actually contained in a bar, coin or piece of jewellery - independent of the object's total weight.

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

The gram (unit symbol g) is the base unit of mass in the International System of Units (SI) and the world's most commonly used weight unit in precious metals trading.

The gross weight is the total weight of a precious metal object including all alloying components, before any deduction for 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 Shakkan system, today used mainly in the pearl trade and equal to exactly 3.75 grams.

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

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

A time-honoured East Asian weight unit for precious metals, the tael carries no single value: depending on the region it falls somewhere between roughly 37.4 g and 37.8 g.

The tola is a long-standing South Asian weight unit for gold and silver, fixed at exactly 11.6638 grams and common above all in India, Pakistan and the Gulf trade.

The globally standard unit of weight 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 at exactly 31.1034768 grams.

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