1. Jewelry Identifier
  2. Hallmarks
  3. TOMBAC

* base hallmark

The TOMBAC hallmark: meaning, purity & value

Tombac: copper-zinc alloy with high copper content (~85%). Used in historical European jewelry imitating gold and in non-precious decorative work.

Published May 30, 2026

Quick facts

Metal
base
Common regions
EU-historic

Stamps that mean the same thing

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

What TOMBAC tells you

Tombac: copper-zinc alloy with high copper content (~85%). Used in historical European jewelry imitating gold and in non-precious decorative work.

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 TOMBAC or an equivalent such as TOMBAK.
  3. Photograph it in the Jewelry Identifier app to read the metal, hallmark, and any gemstones from the image.
  4. For a binding result, have an assay office or gemological lab run an XRF purity test.

* Frequently asked

FAQ

Q. Is TOMBAC the same as TOMBAK?
A. Yes. TOMBAC, TOMBAK all denote the same material — base. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a TOMBAC 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, 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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