Units & Weight

The avoirdupois ounce (av. oz) is the mass unit commonly used in everyday Anglo-American commerce, equalling exactly 28.349523125 grams, and differs significantly from the troy ounce used in precious metal trading, which weighs 31.1035 grams.

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

Fine weight indicates the actual quantity of pure precious metal contained 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 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 most widely used weight unit in the precious metals trade worldwide.

Gross weight is the total weight of a precious metal object including all alloying components, before any deduction for impurities or additives.

Karat (abbreviated kt or ct) is the traditional unit of measurement for the gold content of an alloy: 24 karat equals pure gold (999 ‰ fineness, highest traded purity 999.9 ‰).

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

Japanese unit of weight from the traditional Shakkan system, today used primarily in the pearl trade and 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 within the troy system equal to 1/20 of a troy ounce, used primarily in Anglo-American jewellery and goldsmithing trades.

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

The tael is a traditional East Asian unit of weight for precious metals whose exact mass varies by region, ranging from approximately 37.4 g to 37.8 g.

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

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

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