Rose gold
A gold alloy with a high share of copper that gives it a pink to reddish colour.
Rose, pink and red gold
The names describe the same family of alloys with different amounts of copper. Pink gold has the least copper and the softest colour, rose gold sits in the middle and red gold has the most copper. Small amounts of silver or zinc fine-tune the shade.
Karat and colour
Lower karat rose gold contains less gold and more copper, so 14k rose gold usually looks pinker than 18k rose gold, which looks more golden. A 14k and an 18k rose gold ring of the same design can look noticeably different side by side.
Wear and care
Copper makes rose gold quite durable. It does not need plating, and its colour can deepen slightly over many years as the surface oxidises.
Rendering rose gold
Rose gold is easy to oversaturate. A material that looks perfect on a bright monitor can come out too orange or too pink on phones. Pick a rose gold material that matches your cast metal and check the result on more than one device. Tone mapping also affects warm metals, so judge the exported image, not only the viewport.
Rose gold pairs well with warm and neutral backgrounds. Very cool grey or blue backgrounds can make it look muddy. When you sell a design in three metals, keep the camera, pose and environment identical so colour is the only thing that changes between variants.