What is an alloy in jewellery?
By Jared James · Last updated 21 May 2026
Definition
An alloy is a blend of two or more metals, or a metal mixed with another element, melted together to create something better than the base metal on its own. Almost all the gold and silver in jewellery is an alloy, because the pure forms are too soft to last. Gold under 24k is mixed with metals like copper and silver, and sterling silver is 92.5% silver with 7.5% copper. Alloying can make a metal harder, change its colour, or bring the cost down.
Frequently asked questions
- Why is gold alloyed with other metals?
- Pure 24k gold is very soft and bends and scratches easily, so it is mixed with metals like copper, silver and zinc to make it strong enough for everyday jewellery. The mix also sets the karat and the colour.
- What is the alloy in sterling silver?
- Sterling silver is an alloy of 92.5% pure silver and 7.5% other metal, usually copper. The copper adds the hardness pure silver lacks, which is why sterling is stamped 925.
- Does alloy affect the colour of gold?
- Yes, the alloy metals are what create the different gold colours. Copper gives rose gold its warmth, while metals like silver, zinc and palladium are used to make white and paler yellow golds.
Designing a ring
Talk through alloy with us
Tell us what you have in mind, even if it is only a budget and a piece of jewellery type, and we will help you weigh up the options. We reply to every enquiry, usually within one business day.
Contact the studio