Is COBALT the same as Cobalt Chrome?

Yes. COBALT, Cobalt Chrome all denote the same material — other metals. Different markets and eras stamp it differently, but the purity is identical.

How do I confirm a COBALT stamp is genuine?

Look at the mark under 10× magnification for crisp, even strikes, cross-check the weight-to-volume ratio against the expected density (8.5 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.

* Other Metals hallmark

The COBALT hallmark: meaning, purity & value

COBALT chrome rings are hard, hypoallergenic fashion metal — not precious-metal scrap.

Published May 30, 2026

Quick facts

Metal: Other Metals
Common regions: United States
Density: 8.5 g/cm³
Standard: ISO 9202

Stamps that mean the same thing

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

What COBALT tells you

COBALT chrome rings are hard, hypoallergenic fashion metal — not precious-metal scrap.

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 COBALT or an equivalent such as Cobalt Chrome.
Weigh the piece and estimate its volume — the density should land near 8.5 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.

Sources

ISO 9202
Trade hallmark references

* Frequently asked

FAQ

Q. Is COBALT the same as Cobalt Chrome?: A. Yes. COBALT, Cobalt Chrome all denote the same material — other metals. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a COBALT 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 (8.5 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.

* Try it

Identify the jewelry in your hand, right now.

Just take a photo — AI reads the metal, gemstone, hallmark, era, and an estimated value range in seconds. First two scans free, no account required.

Identify your jewelry now — free App Store

* Related