A common alloy for pink gold is 75wt% gold, 16wt% copper, 9wt% silver by mass. Pink gold is also known as rose gold or red gold. Although the names are often used interchangeably, the difference between red gold, rose gold and pink gold is related to the copper content in the gold alloy. The lower the copper content the more subtle the pink hue. Pink gold will therefore vary quite a bit as copper is reduced and other admix metals are increased in the gold alloy mixture. Pink gold can also be incorporated onto a gold alloy substrate by electrodeposition of a hard, bright, pore-free ductile gold alloy having a pink coloration, useful for decorative purposes. This is effected using an aqueous cyanide-free electroplating bath. Pink gold is a subtle shade in the red spectrum and is well-matched for selection when considering bi- or tr- colour combination in jewellery products.
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