This is the thing most people actually want to know, so let's be precise about it — because a lot of brands aren't.
Stainless steel contains nickel. Around one part in ten. Any jewellery brand telling you their stainless steel is nickel-free is either mistaken or hoping you won't check.
But nickel content isn't what causes reactions. Nickel release is.
A nickel allergy is triggered when nickel comes out of a metal and onto your skin — which happens readily with cheap plated alloys, and barely at all with stainless steel. The nickel in steel is bound into the alloy structure rather than sitting loose at the surface. This is precisely why European law regulates the release rate of nickel in jewellery rather than banning nickel outright.
And there's a second layer of protection: at 2.5 microns of gold, the surface in contact with your skin isn't steel at all. It's gold.
What we can also tell you plainly: there is no copper anywhere in our pieces. Green marks on skin are a copper reaction. Ours can't cause them, because there's nothing there to react.
If you have a diagnosed nickel allergy, we'd rather you spoke to your dermatologist than took a jewellery brand's word for it. Including ours.