* rhodium hallmark
The Rh hallmark: meaning, purity & value
Rhodium. Bright white, highly reflective. Almost never used as solid metal in jewelry due to cost (often priciest precious metal by weight); used as plating over white gold and silver.
Published May 30, 2026
Quick facts
- Metal
- rhodium
- Common regions
- international
- Density
- 12.41 g/cm³
- Melting point
- 1964 °C
Stamps that mean the same thing
This purity may be struck into jewelry as any of: Rh / RHODIUM. The mark differs by country and era, but the metal content is identical.
What Rh tells you
Rhodium. Bright white, highly reflective. Almost never used as solid metal in jewelry due to cost (often priciest precious metal by weight); used as plating over white gold and silver.
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 Rh or an equivalent such as RHODIUM.
- Weigh the piece and estimate its volume — the density should land near 12.41 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 Rh the same as RHODIUM?
- A. Yes. Rh, RHODIUM all denote the same material — rhodium. Different markets and eras stamp it differently, but the purity is identical.
- Q. How do I confirm a Rh 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 (12.41 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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