What are the best materials for custom rings for people with metal allergies?

About a third of the clients who come to my bench with a metal allergy story are actually allergic to the nickel in standard 14k white gold. Another third are reacting to the rhodium plating wearing off and exposing that nickel-white alloy underneath. The rest-well, it's usually a contact dermatitis from lotion trapped under a ring, not the metal at all. But the allergy is real, and if you have it, you need to know which alloys are safe and which aren't.

Here's the short version: palladium, platinum, 18k yellow gold, and certain palladium-white golds are the safest bets. Titanium and tantalum are also hypoallergenic if you want something nontraditional. What you want to avoid is any alloy with nickel-most white golds under 18k, and a lot of the cheaper platinum substitutes like cobalt chrome or stainless steel that claim to be "hypoallergenic" but still cause reactions in sensitive people.

Platinum

Platinum is the gold standard for allergy-free jewelry, pun intended. 950Pt-which is 95% pure platinum, alloyed with ruthenium or cobalt-is almost entirely inert. I've never seen a true platinum allergy. The catch? It's expensive-roughly double the metal cost of 18k gold, depending on market prices-and it's soft enough to scratch and bend over time. I mentioned earlier that I think platinum is overrated for prong wear in a daily-wear ring: it deforms before it abrades, which means prongs can loosen. But for someone with a serious nickel allergy, the trade-off is worth it.

18k Yellow Gold

18k yellow gold is 75% pure gold, alloyed with copper and silver-no nickel. For most people with mild to moderate metal allergies, this is the best everyday option. It's warm in color, durable enough for a wedding band, and far more affordable than platinum. The alloy mix matters: make sure your jeweler uses a nickel-free formula. Stuller, for example, has a specific nickel-free 18k yellow gold casting grain. I use it for almost every custom piece that involves an allergy concern. 14k yellow gold is trickier-some formulations include nickel to harden the metal, especially in the U.S. Always ask for the exact mill certificate or casting grain spec sheet.

Palladium White Gold (Nickel-Free White Gold)

If you want a white metal without the yellow glow, skip standard 14k white gold (which is usually alloyed with 10-15% nickel and then rhodium-plated for whiteness). Instead ask for palladium white gold-18k with palladium as the whitening alloy instead of nickel. This is sometimes called "nickel-free white gold" or "palladium white gold." It's naturally white without rhodium plating-though I still plate most of mine for uniformity-and it's about 15-20% more expensive than standard white gold. A client named Priya came to me last year with a rash that had been misdiagnosed as a platinum allergy. I swapped her 14k white gold setting for an 18k palladium-white one, and the redness cleared up in a week. No plating needed.

Palladium Itself (950Pd)

Palladium is a noble metal in the platinum group, and 950Pd is 95% pure. It's lighter than platinum, grayer in color-think a cool, subtle gray, not the bright white of rhodium-plated white gold-and it's hypoallergenic. I use it for men's wedding bands and women's rings where a lightweight, durable white metal is the priority. The downside: it's less common, so fewer jewelers have experience working with it, and resizing can be tricky. But for a one-time custom job, it's a solid choice. A 4.5mm domed palladium band runs about $900-$1,200 in metal alone, depending on market rates.

Alternative Metals: Titanium, Tantalum, and Argentium Silver

For clients who want something outside the traditional precious metals, titanium and tantalum are both completely nickel-free and hypoallergenic. Titanium is lightweight, strong, and dark gray-but it cannot be resized. If you order a titanium band and your finger swells, you're buying a new ring. Tantalum is heavier, has a deeper blue-gray color, and also can't be resized. I tell clients that if they're considering either, get sized on a warm day and after exercise, and accept that resizing is not an option. Argentium silver-935 or 960 with germanium-is also nickel-free and tarnish-resistant, making it a good budget option for costume or occasional wear. But it's still silver, and I stand by my rule: sterling silver does not belong in fine jewelry meant to be worn every day. Argentium is an exception only if you understand that it will still scratch and bend more than gold or platinum.

What to Avoid

The biggest culprit is standard 14k white gold. Most of the stuff coming out of major jewelry manufacturers in the U.S. is alloyed with nickel to get that cool white color without adding palladium's cost. If you have a nickel allergy, do not wear 14k white gold. The rhodium plating is temporary-it wears off in about 12-18 months with daily wear-and the underlying nickel-white alloy will react with your skin. I've seen it happen dozens of times. Similarly, cobalt chrome and stainless steel are marketed as hypoallergenic but contain nickel in many formulations. Always ask for the alloy's composition in writing.

One more thing: if you're allergic to nickel, you should also be cautious with rose gold. Most 14k rose gold contains at least some nickel in the copper-based alloy blend. 18k yellow or rose gold from a reputable supplier like Hoover & Strong or Stuller is usually nickel-free, but verify it. I keep a small box of "scratch test" samples at my bench-little polished squares of every common alloy-and I let allergic clients wear one against their skin for a day before committing to the job. That test has saved me more than one remake.

The bottom line

For a daily-wear custom ring, start with 18k yellow gold or palladium white gold. If your budget allows, platinum. If you're set on a nontraditional look, titanium or tantalum-but only if you're sure about your size and willing to replace the ring rather than resize it. And whatever you choose, ask your jeweler for the exact alloy composition in writing. A seller who can't or won't provide that is a red flag. I send clients to GIA's alloy database or the company's spec sheets when they want to check. It's your skin. You get to be picky.