What are the best metal options for sensitive skin in a custom ring?

About 23 years ago, a client named Priya came in with a rash that looked like a chemical burn. She'd been wearing a 14k white gold engagement ring for about a month, and the skin under the shank was red, itchy, and starting to peel. She assumed she was allergic to gold. She wasn't. She was allergic to nickel - specifically, the nickel alloy used in the 14k white gold. That's the most common story I hear, and it's usually not the metal itself causing the problem. It's the alloy.

Nickel is the culprit in most white gold alloys, especially in 14k and 10k. The lower the karat, the higher the percentage of alloy metals, and the more likely you'll react. 18k white gold, by contrast, uses a higher gold content (75%) and less nickel. But even that's not a guarantee. The smarter play for sensitive skin is to skip nickel-white altogether and go with palladium-white 18k - an alternative alloy that replaces the nickel with palladium. It's slightly grayer in tone but still rhodium-plates to a bright white. I've used Stuller's palladium-white 18k for years and had exactly one complaint about it, and that turned out to be a reaction to the rhodium bath, not the metal.

Platinum: the old reliable, with a catch

Platinum is often called hypoallergenic, and it is - for most people. 950Pt/Ru (95% platinum, 5% ruthenium) and 950Pt/Co (cobalt) are both nickel-free. The ruthenium alloy is harder, better for prongs. The cobalt alloy casts cleaner. Neither will trigger a nickel allergy. But here's the thing I tell clients: platinum is dense. A platinum ring weighs about 60% more than the same ring in 18k gold. That's not an allergy issue, but it's a daily-wear issue. And because platinum is softer than white gold alloys, it scratches more easily. It doesn't lose metal - it displaces it - but the surface will show wear faster. If that bothers you, palladium-white 18k with occasional rhodium re-plating might be the better call.

14k vs. 18k: not the same for sensitive skin

If you really want yellow gold, 18k is almost always fine. The alloy metals in 18k yellow are usually copper and silver - no nickel. Most 14k yellow gold alloys do contain nickel, though at lower percentages than white gold. I've had clients who react to 14k yellow but not 18k yellow. It's a real thing. The fix is simple: go with 18k yellow or rose. Rose gold gets its color from copper, not nickel, so it's generally safe too. The color is reddish pink, which not everyone wants for an engagement ring, but it's a solid option for bands.

The alternatives I don't usually recommend for daily wear

• Argentium silver: 935 or 960 with germanium. Tarnish-resistant, nickel-free, and cheap. But for a piece meant to be worn every day - like a wedding band - sterling silver (even Argentium) is too soft. It dents, it scratches, and it eventually bends out of round. For occasional wear? Fine. For a ring that's going on and off every day for thirty years? Hard pass.
• Titanium: Hypoallergenic, light, strong. But it cannot be resized. At all. If your finger changes size - and it will - you're buying a new ring. Also, titanium rings are a nightmare for stone setting. Most bench jewelers, me included, will refuse to set a center stone in titanium because the metal work-hardens so aggressively that it chews up setting tools and risks damaging the stone. For a plain band? It works. But that's about it.
• Cobalt chrome: Hypoallergenic, very hard, scratch-resistant. It's a common choice for men's bands. Same resizing limitation as titanium - can't be done. But if you know your finger size and you never want to change it, cobalt chrome is a legitimate option. It's heavy, though, and white with a slightly bluish tint. Worth seeing in person before committing.
• Tungsten: I have strong feelings about tungsten. It's basically indestructible, which sounds great until you realize that also means it cannot be resized and cannot be cut off with normal ring cutters in an emergency. Most ERs and fire stations have carbide ring cutters now, but it's still a genuine risk. And tungsten is often bonded with nickel or cobalt binders. A nickel-allergic client can have a reaction to the binder over time as the surface wears. I'd steer clear for daily wear if you have known sensitivities.

The one metal I rarely mention but should

950 palladium. It's grayer than platinum, lighter in the hand, and fully nickel-free. It's also about half the cost of platinum per gram. The catch is that not every jeweler works with it - it's a niche alloy. But for a client with severe allergies who wants a white metal, palladium is worth a conversation. I've set a few engagement rings in it. The prongs need more care during setting because the metal is softer than 18k, but the finished piece holds up well. Resizing is possible, though it requires an experienced hand because the alloy is trickier to solder.

What to actually ask your jeweler

Don't walk in and say "I need a hypoallergenic ring." Say "I know I'm allergic to nickel. Can you tell me the exact alloy composition of the metal you'd be using?" A jeweler who can answer that - Stuller's 18k palladium-white, or a specific platinum alloy from Hoover & Strong - knows what they're talking about. A jeweler who says "don't worry, it's fine" without specifics is someone you should walk away from.

I had a client last spring, Marco, who'd been told by three jewelers that platinum would solve his allergy. It didn't. Turned out he was reacting to the nickel in the polishing compounds left on the ring after final finish. A fifteen-minute ultrasonic clean and steam, and the reaction stopped. That's rare, but it happens. The point is: if you have a metal sensitivity, start with a nickel-free alloy - 18k palladium-white, 18k yellow, 950 platinum, or 950 palladium - and then ask your jeweler to give the ring an extra-long ultrasonic and steam clean before you take it home. That's about $30 in labor. It might save you a return trip.