Pure platinum is soft and malleable, but the heat-treated alloy can be as hard as stainless steel. https://en.wikipedia.org/wiki/Platinum-iridium_alloy https:/

Pure platinum is soft and malleable, but the heat-treated alloy can be as hard as stainless steel. https://en.wikipedia.org/wiki/Platinum-iridium_alloy https://en.wikipedia.org/wiki/Platinum-iridium_alloy