Is GF the same as GOLD FILLED?

Yes. GF, GOLD FILLED, G.F. all denote the same material — gold-filled. Different markets and eras stamp it differently, but the purity is identical.

How do I confirm a GF 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, scan it with the Jewelry Identifier app, and — when it matters — have an XRF test done by an assay office or gemological lab.

* gold-filled hallmark

The GF hallmark: meaning, purity & value

Gold filled. Bonded gold layer making up at least 1/20 (5%) of total weight per FTC standards. Far more durable than gold plating; lifespan in normal wear comparable to solid karat gold.

Published May 30, 2026

Quick facts

Metal: gold-filled
Common regions: United States, international

Stamps that mean the same thing

This purity may be struck into jewelry as any of: GF / GOLD FILLED / G.F.. The mark differs by country and era, but the metal content is identical.

What GF tells you

Gold filled. Bonded gold layer making up at least 1/20 (5%) of total weight per FTC standards. Far more durable than gold plating; lifespan in normal wear comparable to solid karat gold.

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 GF or an equivalent such as GOLD FILLED.
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

FTC Jewelry Guide 16 CFR Part 23.5
Wikidata Q5577717

* Frequently asked

FAQ

Q. Is GF the same as GOLD FILLED?: A. Yes. GF, GOLD FILLED, G.F. all denote the same material — gold-filled. Different markets and eras stamp it differently, but the purity is identical.
Q. How do I confirm a GF 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, 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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