Metal Allergies: Causes, Trigger Metals & Material Risks Explained
Metal Allergy & Jewellery Materials
— What You Need to Know
A Personal Note
Concerns about metal allergies have always been part of how people choose jewellery — and for good reason. I know this firsthand: I have a metal allergy myself. There have been many times when wearing earrings left my skin itching, swollen, and weeping. It was uncomfortable, frustrating, and discouraging.
That experience is exactly why material choice sits at the heart of everything SMUK makes. This guide is our way of sharing what we've learned — so you can choose jewellery with confidence, knowing what you're putting against your skin.
Choosing the right material
is the first step toward jewellery
you can wear every day, without worry.
What Is a Metal Allergy?
A metal allergy occurs when metal comes into contact with sweat or sebum, causing it to ionise. These metal ions are then absorbed into the skin, triggering an immune response. Symptoms include itching, redness, swelling, blistering, and weeping — all of which can be quite severe.
Not everyone reacts to the same metals, and sensitivity varies widely between individuals. What makes metal allergies particularly important to understand is that once sensitised, the body can begin reacting to metals it previously tolerated — which is why choosing materials carefully from the start matters.
Common Allergen Metals in Jewellery
Understanding which metals carry higher allergy risk is the foundation of smarter jewellery choices. The table below outlines the most common metals and their associated risk levels.
| Metal | Allergy Risk | Notes |
|---|---|---|
| Nickel | Very High | The most common culprit. Widely used in inexpensive plating, fashion accessories, buttons, and watch components. A large proportion of the population reacts to nickel. |
| Cobalt | High | Produces reactions similar to nickel. Found in alloy plating, magnets, and some medical device components. |
| Chromium | Moderately High | Used in watch straps and some industrial plating. Also present in stainless steel, tools, and automotive components. |
| Copper / Brass | Moderate | Oxidises easily, leading to verdigris with prolonged wear. Commonly used in low-cost jewellery and accessory fittings. |
| Surgical Stainless Steel (316L etc.) | Some Risk | Contains iron, nickel, and chromium. Relatively stable but not completely inert. Widely used in kitchenware, everyday items, earring posts, and watch straps. |
| Platinum / Gold (High Purity) | Very Low | The higher the purity, the lower the risk. Generally well-tolerated even by those with sensitivities. |
| Silver 925 | Low | Contains no nickel or cobalt. Simple alloy composition of 92.5% silver and 7.5% copper. Rare individual reactions are possible, but risk is comparatively low. |
Why SMUK Uses Silver 925
A brand's material choices reflect its values. At SMUK, our commitment to silver 925 comes directly from a genuine concern for the wellbeing of the people who wear our pieces.
- No nickel, cobalt, or chromium in the base material — the metals most commonly associated with allergic reactions
- Simple alloy composition: 92.5% silver, with the remainder primarily copper
- Oxidation (tarnishing) from sweat and sebum is a surface phenomenon — it is not the same as an allergic reaction, and does not increase allergy risk
- Tarnish is easily restored to a bright finish with a polishing cloth
- Silver 925 has a long history of use in jewellery for its low impact on skin
SMUK uses rhodium plating, 14K white gold plating, and 18K gold plating across our collections. These are generally considered low-allergy-risk finishes. That said, in very rare cases, individuals may react even to these materials. In our own experience, we have had one instance of a customer reacting to a platinum-type coating. If you have concerns, we always recommend consulting a dermatologist before purchase.
Why the Base Material Matters
When choosing jewellery, it's easy to focus only on the surface finish. But for long-term skin safety, the base material deserves equal — if not greater — attention.
- Some accessories use brass or mixed alloys as a base, with only a surface plating applied on top
- Once that plating wears away, allergen-containing metals in the base can come into direct contact with the skin
- At SMUK, every piece uses silver 925 as the base — so even as surface finishes wear over time, the material touching your skin remains low-risk
Labels such as "hypoallergenic" or "surgical stainless steel" do not always guarantee that the base material is free of nickel or chromium. Before purchasing jewellery — especially at lower price points — it is worth checking the full material composition, not just the surface finish.
Key Takeaways
Metal allergy risk can be significantly reduced through informed material choices. Here is a summary of the main points from this guide.
- Metal allergies vary by individual — sensitivity is not universal
- Nickel, cobalt, and chromium are the most common allergens in jewellery
- Silver 925 is a comparatively low-risk material with no nickel or cobalt
- Surgical stainless steel contains nickel and chromium — it is not allergy-free
- SMUK uses silver 925 as the base for all pieces, with carefully selected low-risk plating
- If you have a known sensitivity or history of reactions, please consult a dermatologist
Every SMUK product is made with metal allergy awareness in mind. Our product pages clearly indicate allergy-conscious materials. If you have any questions before purchasing, please don't hesitate to contact us.
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