1. Jewelry Identifier
  2. Hallmarks
  3. NIOBIUM

* niobium hallmark

The NIOBIUM hallmark: meaning, purity & value

Niobium. Hypoallergenic, anodizable to wide color range without coating. Common in alternative wedding bands.

Published May 30, 2026

Quick facts

Metal
niobium
Common regions
international
Density
8.57 g/cm³
Melting point
2477 °C

Stamps that mean the same thing

This purity may be struck into jewelry as any of: NIOBIUM / Nb / COLUMBIUM. The mark differs by country and era, but the metal content is identical.

What NIOBIUM tells you

Niobium. Hypoallergenic, anodizable to wide color range without coating. Common in alternative wedding bands.

How to check it yourself

  1. Examine the stamp under a 10× loupe — genuine marks are crisp and evenly struck, not doubled or smeared.
  2. Confirm the mark reads NIOBIUM or an equivalent such as Nb.
  3. Weigh the piece and estimate its volume — the density should land near 8.57 g/cm³ for this alloy.
  4. Photograph it in the Jewelry Identifier app to read the metal, hallmark, and any gemstones from the image.
  5. For a binding result, have an assay office or gemological lab run an XRF purity test.

* Frequently asked

FAQ

Q. Is NIOBIUM the same as Nb?
A. Yes. NIOBIUM, Nb, COLUMBIUM all denote the same material — niobium. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a NIOBIUM 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 (8.57 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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