* base hallmark
The STEEL hallmark: meaning, purity & value
Stainless steel (typically 316L surgical grade in jewelry). Hypoallergenic, durable, low cost. Common in modern men's bands and watches.
Published May 30, 2026
Quick facts
- Metal
- base
- Common regions
- international
- Density
- 7.98 g/cm³
Stamps that mean the same thing
This purity may be struck into jewelry as any of: STEEL / STAINLESS STEEL / 316L / SS. The mark differs by country and era, but the metal content is identical.
What STEEL tells you
Stainless steel (typically 316L surgical grade in jewelry). Hypoallergenic, durable, low cost. Common in modern men's bands and watches.
How to check it yourself
- Examine the stamp under a 10× loupe — genuine marks are crisp and evenly struck, not doubled or smeared.
- Confirm the mark reads STEEL or an equivalent such as STAINLESS STEEL.
- Weigh the piece and estimate its volume — the density should land near 7.98 g/cm³ for this alloy.
- Photograph it in the Jewelry Identifier app to read the metal, hallmark, and any gemstones from the image.
- For a binding result, have an assay office or gemological lab run an XRF purity test.
* Frequently asked
FAQ
- Q. Is STEEL the same as STAINLESS STEEL?
- A. Yes. STEEL, STAINLESS STEEL, 316L, SS all denote the same material — base. Different markets and eras stamp it differently, but the purity is identical.
- Q. How do I confirm a STEEL stamp is genuine?
- A. Look at the mark under 10× magnification for crisp, even strikes, cross-check the weight-to-volume ratio against the expected density (7.98 g/cm³ for this alloy), scan it with the Jewelry Identifier app, and — when it matters — have an XRF test done by an assay office or gemological lab.
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