Glossary: IRIDIUM
Knowledge Centre > Jewellery Terms > Metals


Part of the platinum family, it is used as an alloy for platinum to create a harder metal. Platinum is generally alloyed with 3% copper to make it softer; if a harder metal is wanted, the alloy is 10% iridium and for a medium hard alloy, 5% is used. The hardness of iridium also makes it serviceable for pen nibs.


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Updated 2/12/2023 at 5:17PM

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