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Conversion Factors

The traditional measure for precious metals, the troy ounce from the Anglo-Saxon system, is still the most important basis for calculation in the precious metals trade, despite the transition to the metric system.
Weight Conversion
1 Ounce (oz) 31.1034768 gram*
1 Kilo about 32.1507 oz
12.5-kg-Barren about 400 oz
1 Tonne about 32,150 oz
* (For conversions, a rounded 31.1035 grams is commonly used.)
In the international trade, fineness is measured to the 1/1000, but in the jewelry sector carats are used.
Weight Conversion
1 carat 41.67 thousandth parts
9 carat 375.00 thousandth parts
14 carat 583.33 thousandth parts
18 carat 750.00 thousandth parts
22 carat 916.67 thousandth parts
24 carat 999.90 thousandth parts
Metal Specific Weight Melting Point
Gold 19.32 g/cm³ 1,063 cent.
Silver 10.50 g/cm³ 961 cent.
Platinum 21.00 g/cm³ 1,769 cent.
Palladium 12.02 g/cm³ 1,554 cent.
Rhodium 12.41 g/cm³ 1,966 cent.
Iridium 22.65 g/cm³ 2,454 cent.
Ruthenium 12.45 g/cm³ 1,966 cent.

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