Guides · 10 Jul 2026 · 4 min read

Gold-plated, gold-filled and solid gold: the difference

Three pieces can look identical in a photo and be very different things. The difference is how much gold there is, where it is, and how it wears.

Three cross-sections showing a thin, a medium and a full gold layer over a grey core, drawn in gold line on black
From left to right: plated, filled, solid. The gold is the bright layer; the grey is base metal.

Gold-plated

A base metal piece, usually brass, copper or steel, is coated with a very thin layer of gold by electroplating. The layer is measured in microns, and ordinary plating is under one micron; "heavy" plating is 2.5 microns or more. Marks to look for: GP, GEP, HGE, RGP (rolled gold plate), or just nothing at all. It is cheap, it photographs well, and on a ring or a bracelet it wears through at the edges within months. Once the base metal shows, it can also mark the skin green or grey.

Vermeil is a special case: sterling silver (925) plated with gold; in the US the gold must be at least 2.5 microns thick and 10K or better. Better than plated brass, still a coating.

Gold-filled

Despite the name, nothing is filled. A thick sheet of karat gold is bonded to a base metal core with heat and pressure, then the sandwich is drawn into wire or rolled into sheet. The gold must be at least 5 percent of the total weight, and the usual mark is 1/20 14K GF (one twentieth by weight, 14K gold). The gold layer is many times thicker than plating, so a gold-filled chain can look new for years. It is a real step up, and a good choice for everyday pieces, but the gold is still a skin, and it will not survive resizing or repair that cuts through it.

Solid gold

The alloy is the same all the way through: 9K, 14K, 18K or 22K gold mixed with other metals, marked 375, 585, 750, 916 or the karat. There is nothing to wear through. It can be resized, repaired, re-polished and eventually melted and remade; its metal value is real and it is what a hallmark certifies. It costs more because you are buying the gold itself, not a finish.

How each wears

Friction is the enemy of any layer. Rings and bracelets rub against everything; pendants and earrings hardly rub at all. So a plated pendant may look fine for years while a plated ring is tired in a season. Gold-filled extends all of that by a large factor. Solid gold only gets the soft scratches and patina that a polish removes.

How to check a piece you own

  1. Read the marks with a loupe: karat or fineness numbers mean solid; GP, GEP, HGE, RGP mean plated; GF or 1/20 means gold-filled; 925 with a gold colour usually means vermeil.
  2. Look at the wear points: the inside of a band, the back of a pendant, the clasp. A different colour showing through means a layer.
  3. Magnet: gold is not magnetic, but neither are brass, copper or silver, so a magnet only catches steel cores. A positive result proves plating; a negative result proves little.
  4. Ask a jeweller: an acid test on a hidden spot or an XRF reading takes a minute and settles it without harming the piece.

DiOro999.9 lists solid gold only, with the purity and the weight on every listing. Plated and filled pieces have their uses; they are simply not what we sell, and the difference should be plain before you pay.

Questions people ask

How thick is plating?

Usually very thin: ordinary gold plating is a fraction of a micron to about half a micron of gold over brass or steel. Heavy gold plating, sometimes called gold electroplate or HGE, is 2.5 microns or more. For comparison, a human hair is about 70 microns across. Thin plating wears through at the edges in months of daily wear; heavy plating lasts years on a pendant and less on a ring.

Does gold-filled tarnish?

Not while the gold layer is intact, because the surface is real karat gold, usually 14K. The layer is thick enough to last many years, but once it wears through at a point of friction the brass underneath can discolour the skin. Gold-filled is a good everyday compromise; solid gold is the one that never changes.

How do I check a piece I own?

Read the stamp first: 14K, 18K, 585 or 750 means solid; GP, GEP, HGE or RGP means plated; GF or 1/20 14K means gold-filled; vermeil is gold over sterling and usually carries a 925. A magnet only tells you if the base is steel. For certainty, a jeweller can do an acid test on a hidden spot or an XRF reading in a minute, without harm to the piece.

Solid gold, stated plainly

Purity and weight on every listing, hallmarked, with the price in US dollars.

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