Steel jewelry — what stands behind the word “medical” and where the downsides are

How does “medical” steel differ from “surgical” and from “jewelry” steel? Usually it does not differ at all, because all three words stand for the same grade of stainless. No standard knows such names, sellers invented them, and that is where half the confusion around steel jewelry comes from. The other half comes from the properties of the alloy itself, which shop windows prefer not to mention.

Three names and one grade of steel

In GOST, ASTM and ISO, steel is designated by numbers and letters: 304, 316L, and in the Russian system 08Kh18N10 and 03Kh17N14M2. Chromium is what makes it stainless, and once there is more than 10.5 % of it in the alloy, an oxide film a few nanometers thick grows on the surface. The film is invisible, it keeps oxygen away from the iron and it repairs itself, because a scratch bares the metal for only seconds, then the protection grows back and there is nothing left to rust.

Two grades turn up most often in jewelry.

• 316L — 16–18 % chromium, 10–14 % nickel, 2–3 % molybdenum and very little carbon, which is what the letter L hints at. Molybdenum takes the hit from chlorides, meaning sweat and seawater, and surgical instruments are made from this grade too, which is where the second trade name comes from.
• 304 — around 18 % chromium and 8 % nickel, with no molybdenum at all. Cheaper and more common, fine for everyday wear, but the first to give in in an aggressive environment.

Of the three trade words, only “surgical” rests on anything at all. Standards for stainless steel for implants do exist, ISO 5832-1 and ASTM F138, only compliance with them is confirmed by a certificate for a batch of metal, and a cardboard tag means nothing.

A magnet will not test steel jewelry either. The advice comes up often, but both grades are austenitic and in the annealed state they are all but indifferent to a magnet, while after stamping and drawing, deformation martensite appears in the structure and the clasp of a chain suddenly starts sticking to the fridge door. That is a trace of cold working, not a sign that the metal has been swapped.

What the tag says and what stands behind it

Common wordings from price tags and what they mean in practice.

What the tag says	What stands behind it
“Medical steel”	No grade by that name exists in any standard. Usually it is 316L or 304 behind it, the same grades a kitchen sink is made from.
“Surgical steel”	Standards for implants do exist, ISO 5832-1 and ASTM F138. Nobody tests a batch of costume jewelry against them.
“Jewelry steel”	A word with nothing inside it: no system of designations knows such a grade, and it says nothing about the level of the work.
“Hypoallergenic”	The term regulates nothing, the alloy holds from 8 to 14 % nickel, and the only question is how much of it reaches the skin.
“Does not tarnish”	True, stainless steel gets neither a sulfide film nor a patina.
“Does not scratch”	Not true, although steel is harder than silver: 5.5–6 on the Mohs scale against 2.5–3. Household dust holds quartz with a hardness of 7, and it takes the polish off.
“Gold-tone steel”	The color comes from a coating a fraction of a micron thick, most often PVD. The layer wears off on the edges and on the inside of a ring.

Why steel does not blacken but does go dull

Silver blackens because hydrogen sulfide from the air and from cosmetics turns its surface into a sulfide, and brass darkens because of the copper in it, which oxidizes and slowly goes to patina. Stainless steel takes no part in these reactions at all, so the promise “does not tarnish” on the tag is honest.

It goes dull for another reason. A polish is a mirror, and a mirror is ruined by scratches, which any small thing leaves behind, from the zipper on a bag and the edge of a sink to sand on the beach. Six months on, instead of shine you see an even matte gray, and it looks like the piece is ruined, though what came off is a layer a few microns thick.

The flaw is on the surface and quite reversible, because steel is the same all the way through, there is nothing in it to spoil, and a stainless steel cloth brings the shine back in a couple of minutes. Silver cleaning solutions are useless here, they simply have nothing to dissolve.

How much nickel steel holds and when it matters

Stainless steel always holds nickel, and the word “hypoallergenic” does not take it out, since 316L holds from 10 to 14 % nickel and 304 around eight percent. What matters is how mobile that nickel is, because in the austenitic lattice it is bound and it barely reaches the skin. The European limit for its release from items in prolonged contact with skin is 0.5 micrograms per square centimeter per week, and sound 316L stays well inside it.

The reputation steel has is earned, but it is not absolute. With a nickel allergy already confirmed, any nickel-bearing alloy can set off a reaction, and the wording on a tag does not cancel that, nor does the price of a piece. The simplest way to check yourself is by experience: wear the piece for a few hours on your wrist, where the skin is calmer than on an earlobe. If redness and itching appear, the question is for a dermatologist, not for the seller.

Where steel is weak

The merits of the alloy are covered above and come down to being undemanding. There are weak spots too, and the shop window keeps quiet about them.

The size cannot be adjusted. A jeweler saws a silver ring open, sets in a piece of shank and solders it up, and with steel that trick does not work. It melts at around 1,400 °C, jewelry solder will not take it, and stretching the ring on a mandrel is blocked by that same hardness of 5.5–6. What is left is to find out your size in advance, and how that is done with a thread and a ruler is set out in the ring size guide. If you do get it wrong, the piece is taken back within two weeks, the terms are on the “Delivery” page.

Repairs are harder. A broken link in a steel chain cannot be soldered, it needs argon arc or laser welding, and not every little workshop by the metro takes on that kind of job.

There is no value in the metal itself, and that is worth knowing before you buy. A steel piece cannot be sold for scrap or melted down, its whole price is made up of the stone and the work. For a handmade piece that is the usual arrangement, because what you pay for is the stone and the hands. But for anyone looking at jewelry as an investment, steel will not do at all.

The shapes of steel jewelry are usually plainer than those in brass, and the reason lies in the metal. Steel is refractory and takes poorly to jewelry casting, so large, three-dimensional pieces in it are rare in handmade collections. The substantial KHALISI majestic bracelet at 22,000 ₽ and Dragon Wing necklace at 39,000 ₽ are built with brass. Steel more often gets the role of a base that holds the shape and does not argue with the stone.

In our jewelry steel works in exactly that way. On the steel base of the Spheres ring at 5,500 ₽ sit three spheres, moonstone, rose quartz and labradorite. The Viviana bracelet at 6,500 ₽ is built from stainless steel and rose quartz. The pattern in that quartz will not repeat anywhere else, because we make every piece by hand and in a single copy. The other rings are waiting in the rings section, bracelets in the bracelets section, and everything together in the catalog.

Common questions

The tag says “medical steel”, is that something special?

No, a grade by that name does not exist in any standard, and what is sold under it is usually 316L or 304. What to look at is the grade designation, not the word on a piece of cardboard.

In short, what is steel praised for and what is it blamed for?

It is praised by anyone who values a piece that asks for little: steel does not blacken, it takes sweat calmly, and at 5.5–6 on the Mohs scale it stands well above silver in hardness. It is blamed because a ring size cannot be changed afterwards, a broken link is repaired only by welding, and the metal has no value of its own.

Will a steel bracelet darken over time?

Darken it cannot, since neither sulfide nor patina forms on stainless steel. The only thing that dulls over time is the polish, scratched in wear, and a stainless steel cloth brings its shine back.

Gold plating on steel and what happens to it

Yellow steel is steel with a coating, and most often it is applied by PVD, physical vapor deposition in a vacuum. A layer of titanium nitride or a similar compound goes onto the surface, close to gold in color and a fraction of a micron thick, and it holds better than cheap electroplating, but noticeably worse than the buyer expects.

The coating wears off unevenly, starting with the places that rub, meaning the edges, the inside of a ring and the links by the clasp. How long the yellow color lives depends on how the piece is worn, and on a ring on your working hand the layer can go in a few months, while on earrings it holds for years. Restoring the coating at a workshop down the street will not work, that needs a vacuum chamber, so all that is left is to protect it from the first day.

Protecting it is not hard, because what a coating fears most is abrasives, and any gold cleaning paste, tooth powder or the rough side of a sponge takes off microns faster than years of wear. Chlorinated pool water and sea salt speed up the wear, while perfume and hairspray leave a film that has to be rubbed off. Soapy water, a soft cloth and a piece taken off before the shower — that is the whole kit.

With a steel base everything is simpler still, but a stone in the setting sets its own terms, since rose quartz fades in bright sun, and moonstone and labradorite dislike knocks against anything hard. In pieces with stones you go by the stone, and how different minerals behave in wear is covered in a separate article and in the “Care” section.

If you remember one thing, let it be the order of things. Cream, perfume and hairspray go on first, the jewelry goes on last, and in the evening it is wiped with a dry soft cloth and put away in a pouch, not left on the bathroom shelf. For steel that habit brings back the shine, for the coating it adds life, and for the stone it saves the polish.