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Metals & materials

Solid gold vs gold-filled, vermeil and plated

Four things sold as gold, with very different amounts of gold in them.

Written by our in-house jewelry team · Updated August 1, 2026 · 6 min read

Vintage gold ring on a bench block among jeweler's hand tools at the goldsmith workbench
Solid gold vs gold-filled, vermeil and plated

In short

Solid gold is a gold alloy all the way through, marked 14K, 585, 18K or 750. Gold-filled has a thick gold layer mechanically bonded to a base metal core, typically 5% of the total weight in the US. Vermeil is gold plated over sterling silver, with a minimum plating thickness required in the US. Plated is a thin gold layer over base metal that eventually wears through.

Almost everything we sell is solid gold, but the terms come up constantly when customers compare what they already own, so it is worth setting them out plainly.

The difference is not only value. It decides whether a piece can be sized, soldered, repaired and passed on, or whether it is essentially disposable.

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The four categories

Solid gold means the metal is a gold alloy throughout. It is stamped with a karat mark or a fineness number, and it can be cut, sized and repaired without exposing another metal underneath.

Gold-filled is a real, thick layer of gold bonded under heat and pressure to a brass core. Under US Federal Trade Commission guidance the gold layer must be a stated fraction of total weight, commonly one twentieth, which is why you see marks like 1/20 12K GF. It lasts for decades of light wear but is not solid gold.

Vermeil is gold over sterling silver. US rules require a sterling base and a minimum plating thickness. It is the best of the plated options because the base metal is precious and hypoallergenic.

Gold-plated, sometimes marked GP or GEP, is a thin electroplated layer, often under one micron, over brass or another base metal. It will wear through at the contact points.

How to tell them apart

Start with the marks. A karat or fineness stamp on its own points to solid gold. Anything with GF, GP, GEP, RGP, HGE or a fraction in front of the karat number is not solid.

Then look at the wear points: the inside of a ring shank, the back of a clasp, a chain where it rubs. Plating shows as a color change to white or pinkish base metal at exactly those places, and solid gold does not.

  • 585 or 14K, 750 or 18K, 375 or 9K: solid gold
  • 1/20 14K GF or GOLD FILLED: gold-filled
  • 925 with a gold color, or VERMEIL: gold over sterling
  • GP, GEP, RGP, HGE, or no mark at all with base metal showing: plated

What it means for repairs and resizing

A solid gold ring can be sized, re-tipped and rebuilt indefinitely by a goldsmith. That is the whole reason antique gold jewelry is still in circulation.

Gold-filled and plated pieces cannot be sized without cutting through the gold layer and exposing the core, and heat from a torch can blister plating. This is why we test the metal of every piece before listing and state the karat rather than describing anything vaguely as gold-tone.

Interior of an antique jewelry shop with wooden vitrines and warm lamplight
Metals & materials — from the pieces and workshop notes behind this guide.

Frequently asked questions

Is gold-filled jewelry worth anything?
It has some scrap value because the gold layer is real and substantial, but far less than solid gold, and it is valued mainly on design and condition rather than metal content.
Does vermeil tarnish?
The gold layer does not, but silver showing at worn edges can, and the sterling underneath will tarnish once the plating thins.
Can gold-plated jewelry be re-plated?
Usually yes, and it is inexpensive, but it is a cosmetic renewal rather than a repair, and it does not make the piece solid gold.
Do you ever sell gold-filled or plated pieces?
Only if the design or the maker makes it worth owning, and then the description states the construction plainly. Everything else in the collection is solid gold with the karat stated.

Written by our estate jewelry team and reviewed by our in-house gemologist. We have been buying and selling European antique jewelry since 1973.

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