Jewellery alloy density table: gold, platinum and silver
Gold alloys run from about 11.5 grams per cubic centimetre for 9K to 19.3 for pure 24K, platinum alloys from about 20.1 to 21.5, and sterling silver is about 10.4. The alloying metal matters as much as the karat: 14K white gold with nickel is lighter than 14K white gold with palladium. Every figure below links to the supplier table it comes from.
3D Jewelry Designer1 min read
| Alloy | Density g/cm³ | Karat | Grams per 1000 mm³ |
|---|---|---|---|
| 9K Yellow Gold (approx.)1 | 11.50 | 9K | 11.50 |
| 10K Rose Gold2 | 11.59 | 10K | 11.59 |
| 10K White Gold (nickel)2 | 11.07 | 10K | 11.07 |
| 10K Yellow Gold2 | 11.57 | 10K | 11.57 |
| 14K Rose Gold2 | 13.26 | 14K | 13.26 |
| 14K White Gold (nickel)2 | 12.61 | 14K | 12.61 |
| 14K White Gold (palladium)3 | 14.11 | 14K | 14.11 |
| 14K Yellow Gold2 | 13.07 | 14K | 13.07 |
| 18K Green Gold2 | 15.90 | 18K | 15.90 |
| 18K Red Gold2 | 15.18 | 18K | 15.18 |
| 18K Rose Gold2 | 15.18 | 18K | 15.18 |
| 18K White Gold (nickel)2 | 14.64 | 18K | 14.64 |
| 18K White Gold (palladium)3 | 15.84 | 18K | 15.84 |
| 18K Yellow Gold2 | 15.58 | 18K | 15.58 |
| 22K Yellow Gold4 | 17.73 | 22K | 17.73 |
| 24K Yellow Gold5 | 19.32 | 24K | 19.32 |
| Palladium 9506 | 12.10 | 950 | 12.10 |
| Platinum 900 (iridium)2 | 21.54 | 900 | 21.54 |
| Platinum 950 (cobalt)5 | 20.10 | 950 | 20.10 |
| Platinum 950 (iridium)5 | 21.50 | 950 | 21.50 |
| Platinum 950 (ruthenium)5 | 20.70 | 950 | 20.70 |
| Sterling Silver 9255 | 10.36 | 925 | 10.36 |
Densities are supplier figures, not estimates. One label can cover more than one alloy, so a shop confirms or edits its own in the studio under Setup, Metals.
Using the table
Find the alloy you will cast in, not just its karat, and read its density. The last column shows what 1000 cubic millimetres of it weighs, which makes the arithmetic visible: a ring with 210 cubic millimetres of metal weighs 0.21 times that figure.
To skip the arithmetic entirely, the metal weight calculator measures the volume straight from a 3D file and weighs it in every alloy here.
Where the figures come from
Each density is taken from a published supplier table, numbered against the alloy and linked underneath, so every figure can be checked at its source. The guide to weight and cost explains how the same table drives weights and prices in the studio.
Questions
How do I turn a density into a weight?
Multiply the metal's volume in cubic centimetres by the density. A model's volume is usually given in cubic millimetres, so divide that by 1000 first.
Why do two white golds of the same karat weigh differently?
Because they are alloyed with different metals. Nickel and palladium have different densities, so the same karat of gold sits in a lighter or heavier mix.
Are these exact for my caster's metal?
They are the suppliers' published figures. A caster's own alloy can differ slightly, so for a quote use the figure they give you for the alloy they pour.
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