Is Pd900 the same as PD900?

Yes. Pd900, PD900 all denote the same material — 90.0% palladium. Different markets and eras stamp it differently, but the purity is identical.

How do I confirm a Pd900 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 (11.6 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.

* Palladium hallmark

The Pd900 hallmark: meaning, purity & value

Pd900 is 90% palladium. Less common than Pd950/Pd500 but appears on European pieces.

Published May 30, 2026

Quick facts

Metal: Palladium
Purity: 90.0%
Fineness: 900/1000
Common regions: European Union, Japan
Density: 11.6 g/cm³
Standard: ISO 9202

Stamps that mean the same thing

This purity may be struck into jewelry as any of: Pd900 / PD900. The mark differs by country and era, but the metal content is identical.

What Pd900 tells you

Pd900 is 90% palladium. Less common than Pd950/Pd500 but appears on European pieces.

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 Pd900 or an equivalent such as PD900.
Weigh the piece and estimate its volume — the density should land near 11.6 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 Pd900 the same as PD900?: A. Yes. Pd900, PD900 all denote the same material — 90.0% palladium. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a Pd900 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 (11.6 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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