In jewellery production, the term rose gold is used to describe a gold alloy that is given a bright reddish colour by the addition of copper. In order to achieve the desired colour, a small amount of silver is added in addition to the copper. The respective proportions of silver and copper are added to the fine gold, the proportion of which is indicated by the carat number and is the basis for the name. Therefore, the rose tones also vary depending on the ratio of the alloy partners. In contrast to red gold, the proportion of copper is slightly lower here, resulting in a lighter colour that is typical of rose gold jewellery. In 8 carat rose gold, 66.7% copper is added, resulting in a darker shade of rose. The jewellery becomes somewhat lighter with a 9 carat alloy. This is composed of 55.5% copper and 6% silver. 14 carat rose gold is composed of 23% copper and 10% silver. The softest shade is found in 18 carat rose gold. Here, 16% copper and 9% silver are added, resulting in a brighter colour and only a delicate rose shimmer.
