Metals
Gold, platinum and silver, by colour and weight.
The 19 metals in Jart's material library: the polished colour the renderer uses, the hallmark, and the density Design Facts uses to weigh a design. Gold alloys vary between refiners by a few percent; ask your caster for theirs.
18k yellow gold
Rose gold
White gold
Platinum
Green gold
Silver
One ring, six alloys
A plain band 17.3 mm inside (about US size 7), 4 mm wide and 1.8 mm thick holds 432 mm³ of metal. The same design in platinum 950 weighs 38% more than in 18k gold. In the studio, Design Facts measures your own design's metal volume and weighs it in each of these.
- 3759k gold11.2 g/cm³4.8 g
- 58514k gold13.1 g/cm³5.7 g
- 75018k gold15.5 g/cm³6.7 g
- 91622k gold17.8 g/cm³7.7 g
- PT950Platinum 95021.4 g/cm³9.2 g
- 925Sterling silver 92510.4 g/cm³4.5 g
Gold
Pure gold is too soft for most jewellery, so it is alloyed. Silver and copper set the colour: more copper turns it rose and red, more silver pale and green. The lower the karat, the paler and harder the metal and the lighter the piece.
| Metal | Hallmark | Polished colour | Density | Band weight |
|---|---|---|---|---|
| 18k yellow gold | 750 | #e8bb65 | 15.5 g/cm³ | 6.7 g |
| Rose gold | 750 | #dfa38d | 15.2 g/cm³ | 6.6 g |
 24k yellow gold | 999 | #e9ad36 | 19.32 g/cm³ | 8.3 g |
 9k yellow gold | 375 | #dcc394 | 11.2 g/cm³ | 4.8 g |
 14k yellow gold | 585 | #e3bf7a | 13.1 g/cm³ | 5.7 g |
 22k yellow gold | 916 | #ebb24c | 17.8 g/cm³ | 7.7 g |
 Warm gold | 750 | #e9b45e | 15.5 g/cm³ | 6.7 g |
 Sand gold | 750 | #e2c9a4 | 15.5 g/cm³ | 6.7 g |
| Green gold | 750 | #d5cb8c | 15.6 g/cm³ | 6.7 g |
 Red gold | 750 | #d68a6c | 15.1 g/cm³ | 6.5 g |
 Light red gold | 750 | #dd9a80 | 15.2 g/cm³ | 6.6 g |
White metals
White gold is gold alloyed with white metals and usually rhodium plated; platinum 950 is denser and heavier for the same design; sterling silver is the lightest. Black rhodium is a plating over white gold.
| Metal | Hallmark | Polished colour | Density | Band weight |
|---|---|---|---|---|
| White gold | 750 | #dadde0 | 15.5 g/cm³ | 6.7 g |
| Platinum | PT950 | #bfc5cb | 21.4 g/cm³ | 9.2 g |
| Silver | 925 | #f0f1f2 | 10.4 g/cm³ | 4.5 g |
 Black rhodium | 750 | #404447 | 15.5 g/cm³ | 6.7 g |
 Grey gold | 750 | #b8b4ab | 15.6 g/cm³ | 6.7 g |
Coloured metals
Anodised colours are thin surface layers rather than alloys. Jart treats them as a colour only, so Design Facts reports their metal volume but no weight.
| Metal | Hallmark | Polished colour | Density | Band weight |
|---|---|---|---|---|
 Blue anodized | — | #4065c4 | — | — |
 Purple anodized | — | #5c3a86 | — | — |
 Wine anodized | — | #7b2c42 | — | — |
Polished colour the metal's reflectance tint at a polished finish, as the renderer uses it. Band weight the 432 mm³ band above in that alloy, before casting loss.
Stones to set in them
The gemstone chart: refractive index, dispersion and colour of every stone in the studio. Stone and metal pairings: which metal suits which stone, rendered. Metal finishes: polished to patina, and what each does to light.
Render these metals on your own design.
Open a 3DM, STL or GLB file, or a sample ring, choose the stone and the metal, and render it photoreal in your browser. No account needed.