- Genuine 304 stainless steel does not tarnish. Chromium forms a passive layer that regenerates itself after a scratch.
- If something still discolors, it is usually coated, a lower alloy, or a clasp made of a different material.
- Care: warm water, a drop of dish soap, wipe dry. That's all.
The short answer: no, if it's genuine 304 stainless steel. The long answer explains why so many chains and bracelets still become dull, green, or stained after a few weeks.
What "tarnishing" actually means
Tarnishing is a reaction of the surface with oxygen and sulfur compounds from air, sweat, and cosmetics. Silver tarnishes, brass tarnishes, copper tarnishes. Stainless steel does not — because chromium on the surface immediately forms a razor-thin oxide layer that prevents further penetration. This layer is invisible and regenerates itself after a scratch. It is called a passive layer.
Why so much jewelry still discolors
Because much of what is sold as "stainless steel" is only stainless steel on the outside. Three cases are common:
- Coated: a base metal, usually brass or zinc, with a thin layer on top. It lasts until it wears through.
- Lower alloy: 201 stainless steel has less nickel and more manganese. It is cheaper but corrodes significantly faster when exposed to sweat.
- Mixed components: Chain made of stainless steel, clasp made of something else. If only the carabiner discolors, that's the reason.
How to recognize 304 stainless steel
Without a lab, there's no reliable test, but three useful clues:
- The magnet. 304 is only weakly or not magnetic in its annealed state. If a magnet sticks firmly, it is more likely another alloy — an indication, not proof, because cold working can make 304 slightly magnetic.
- The weight. Stainless steel is significantly heavier than coated zinc. Anyone who has held both will not confuse them.
- The specification itself. Reputable suppliers state the alloy. If it just says "stainless steel" without a number, that's not a good sign.
Care: almost none
Warm water, a drop of dish soap, soft cloth, wipe dry. No silver polish, no ultrasound with zirconia stones, no abrasive pastes. That's it. If a piece of jewelry needs elaborate care, that says more about the material than about the owner.
