The precious metals of silver and copper are blended in an alloy with pure gold to create rose gold. Gold and copper are the only coloured metals, all the rest are silvery in colour. Rose gold does not occur in nature. Rose gold is made using a mix of pure gold with alloys including copper. Rose gold has a very subtle and delicate colour that intensifies with age. Common 18k rose gold alloy constituent quantities are: 75wt% gold and 25wt% copper and 75wt% gold, 21wt% copper and 4wt% silver. Rose gold may also vary quite a lot in colour depending on the amount of copper mixed with the gold, 9k rose gold has a darker rose-copper colour than 18k rose gold which has a more subtle rose colour. Tumbaga is a gold and copper alloy.
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