Is AU375 the same as Au375?

Yes. AU375, Au375 all denote the same material — 37.5% gold. Different markets and eras stamp it differently, but the purity is identical.

How much is AU375 worth?

Its melt value is the gold spot price × 0.375 × the weight in grams. Buyers then deduct roughly 5–15% for refining and margin, so a quoted buy-back price sits a little below that theoretical figure.

How do I confirm a AU375 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 (11.2 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 hallmark

The AU375 hallmark: meaning, purity & value

AU375 is 9K gold in European chemical notation.

Published May 30, 2026

Quick facts

Metal: Gold
Purity: 37.5%
Fineness: 375/1000
Karat: 9K
Common regions: European Union, United Kingdom
Density: 11.2 g/cm³
Standard: ISO 9202

Stamps that mean the same thing

This purity may be struck into jewelry as any of: AU375 / Au375. The mark differs by country and era, but the metal content is identical.

What AU375 tells you

AU375 is 9K gold in European chemical notation.

How to value it

The melt value of a AU375 piece is gold spot price × 0.375 × weight (g). A buyer typically deducts 5–15% for assay, refining, and margin, so the cash offer lands just under that figure. Stones and complex settings are usually excluded from the metal weight.

Live calculators: gold karat × weight · item × karat estimates · per-gram hub.

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 AU375 or an equivalent such as Au375.
Weigh the piece and estimate its volume — the density should land near 11.2 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 AU375 the same as Au375?: A. Yes. AU375, Au375 all denote the same material — 37.5% gold. Different markets and eras stamp it differently, but the purity is identical.
Q. How much is AU375 worth?: A. Its melt value is the gold spot price × 0.375 × the weight in grams. Buyers then deduct roughly 5–15% for refining and margin, so a quoted buy-back price sits a little below that theoretical figure.
Q. How do I confirm a AU375 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 (11.2 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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