Is RHODIUM the same as Rh?

Yes. RHODIUM, Rh all denote the same material — gold-plated. Different markets and eras stamp it differently, but the purity is identical.

How do I confirm a RHODIUM 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 (12.4 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.

* Gold-Plated hallmark

The RHODIUM hallmark: meaning, purity & value

RHODIUM marks a rhodium plate over white gold or silver. The plate is tiny; value follows the underlying metal, not rhodium bullion.

Published May 30, 2026

Quick facts

Metal: Gold-Plated
Common regions: United States, Japan
Density: 12.4 g/cm³
Standard: ISO 9202

Stamps that mean the same thing

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

What RHODIUM tells you

RHODIUM marks a rhodium plate over white gold or silver. The plate is tiny; value follows the underlying metal, not rhodium bullion.

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 RHODIUM or an equivalent such as Rh.
Weigh the piece and estimate its volume — the density should land near 12.4 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 RHODIUM the same as Rh?: A. Yes. RHODIUM, Rh all denote the same material — gold-plated. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a RHODIUM 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 (12.4 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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