Red gold is a copper-rich alloy of gold. The higher the copper content, the stronger the red colouration. The higher copper content makes the alloy more durable than its yellow or green counterparts.18k red gold is 75wt% fine gold with 25wt% of alloy. 12k red gold alloy is 55wt% copper, 37.5wt% gold, 7.5wt% silver mix. The most common formulation for 12k red gold is 50wt% gold and 50wt% copper. It is also possible to create a much more intense, although brittle, red gold compound using temperature oxidation. The resultant intermetallic red gold is usable for high-end jewellery as an inclusion, as with enamels, rather than as an alloy that can be moulded into any usual jewellery product.
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