Nickel allergy is a form of allergic contact dermatitis: skin exposed to nickel that develops an itchy rash, redness, dry patches or blistering where the metal touched it. It is one of the most common contact allergies there is, and jewellery is one of the most common ways skin meets nickel. The useful question is not “is this jewellery,” it is which metal a specific piece is actually made from — and that varies far more than most labelling makes clear.
Where nickel actually turns up
Lower-karat gold. Karat gold is always an alloy — 24K is the only fully pure form — and the metal mixed in to bring gold down from pure varies by maker. Some alloy recipes use nickel, others copper or silver instead. A karat stamp alone does not tell you which; it states the gold fraction, not what makes up the rest, as covered in what makes rose gold pink.
Nickel-based white gold. Gold does not turn white on its own; it has to be alloyed toward white, and nickel is the most common — and cheapest — metal used to do it. This is the single most common source of nickel contact allergy from fine jewellery, discussed at length in white gold vs platinum.
Fashion and costume jewellery. Base-metal cores under plating frequently include nickel, both in the core alloy and sometimes in the plating bath itself, and this category sees the least consistent regulation of any of them.
“Surgical steel.” This one surprises people: most surgical-grade stainless steel (commonly called 316L) does contain nickel, typically in the region of 10%, bound into the alloy. Many people with mild sensitivity tolerate it well because so little of that nickel is released from the surface — but “surgical steel” describes a grade of alloy, not the absence of nickel, and someone with a strong reaction may not tolerate it at all.
Where nickel cannot be, structurally
Some metals have no reason to contain nickel and are effectively nickel-free by what they are, not by a marketing claim:
- Platinum, alloyed at 950 with another platinum-group metal, not nickel.
- Titanium and niobium, both used unalloyed or nearly so.
- Palladium, including palladium-based white gold, which reaches a white colour without nickel at all.
- High-karat yellow gold (18K and above), where less alloying metal is present overall and makers have less reason to reach for nickel specifically.
- Sterling silver, which is conventionally alloyed with copper rather than nickel.
Why “nickel-free” on a label is not a guarantee
In the European Union, nickel release from jewellery is a legal limit, not a slogan: EU REACH Regulation Annex XVII, entry 27, sets a maximum nickel release of 0.5 µg/cm²/week for items in direct, prolonged contact with skin, tightened to 0.2 µg/cm²/week for posts inserted into piercings during healing, when the tissue is at its most exposed.
The United States has no federal equivalent — there is currently no US law limiting how much nickel a piece of jewellery may release. California’s Proposition 65 lists nickel compounds as a substance requiring a warning label in some contexts, but settlements have specifically exempted jewellery, piercings and medical implants from that warning requirement. The practical result: a piece sold as “nickel-free” in the US is making a voluntary claim with no regulator checking it, and some products marketed that way turn out to mean the visible plating is nickel-free while the base metal underneath is not — which only becomes obvious once the plating wears through.
What this means in practice
For someone who already knows they react to nickel, the useful filter is asking what alloy family a piece actually belongs to — is white gold here nickel-based or palladium-based, is that steel actually nickel-free grade or just called “surgical” — rather than trusting a label alone. This page describes what is in the metal; it is not medical advice, and a dermatologist or allergist can confirm a specific sensitivity with a patch test far more reliably than any of the above.