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Copper is an easily moulded base metal that is often added to precious metals to improve their elasticity , flexibility , hardness , colour , and resistance to corrosion . Gold is one of the most common alloyed metals with copper . Most jewellery stores carry 18C palladium white gold , 18C rose gold , 18C pink gold , 18C light green gold and 18C yellow gold ( the most commonly used gold alloy in jewellery-making ). Sterling silver is also a copper alloy used to make utensils , tableware , and jewellery . It ’ s a harder alloy than gold , making it an obvious choice for items such as rings and bracelets , while much sterling silver jewellery is also nonirritating thanks to copper ’ s hypoallergenic properties .

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