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14K GF, GP, HGE: What the Letters After a Gold Stamp Mean

By Illiana Brook · Updated

The short answer

Go by the letters. 14K GF means gold-filled: a thin layer of real 14-karat gold bonded over brass, roughly five percent gold by weight on a good day. GP, GEP, HGE, and RGP mean plating, which is thinner still. Only a karat mark with nothing after it, like 14K or 585, claims solid gold.

Picture two yellow chains in the same thrift-store tray. They’re the same thickness, they feel the same in your hand, and they cost the same. One tag says 14K, and the other says 1/20 14K GF.

One of them is worth a closer look. The other is worth about as much as a nice lunch. The difference is two letters, and most people never read them.

What the letters mean

Stamp What it means
14K or 585, nothing after it Claims solid 14-karat gold, 58.3% pure
1/20 14K GF Gold-filled: a bonded layer of 14K gold over base metal
GP or GEP Gold-plated: a microns-thin gold skin
HGE Heavy gold electroplate: a thicker coat, still plating
RGP Rolled gold plate: a thin gold skin
Vermeil Gold over sterling silver

The number tells you the karat of the gold layer, and the letters tell you how little of it there is. A stamp that says 14K GF is telling the truth. The buyer who only reads the 14K fools themselves. The same goes for 10K GF or 18K HGE.

Read every letter

The letters are small. Sometimes they’re crowded against the number or half worn away. Hold your phone’s flashlight low and to the side so the stamp throws a shadow, then zoom in and take a photo.1

Someone pulled a ring off the junk racks for $1.29. It was stamped 10KG, with faded characters after it, and the first reply online was “I would suspect that 10KG means gold filled, or plated.”2 Nobody tested it, but that reply had the right instinct. When letters follow the number, assume a thin skin of gold until a test says otherwise.

How to spot gold-filled in your hand

Look at the curve of the clasp under a 10x loupe. Gold-filled and plated pieces wear through first where they rub, at the clasp, inside a ring band, and along the links. You’ll see a faint change of color where the brass shows.

A magnet won’t help you here, because brass isn’t magnetic either.3 Gold showing in a deep scratch doesn’t prove much either, since heavy electroplate has a thick coat. In one December 2025 thread, someone called a scratched “18K” ring solid for that reason, and the next person spotted a faint HGE after the 18K.4

So, should you buy it?

If there are letters after the number, buy it because you like it or because of the maker, and pay a costume price. If there are no letters, run the four stamp checks before you trust it.

Chapter two of my book covers the letters, the stamps, and the rest of a first thrift trip. You can read chapter one free, and my hallmark chart has every common stamp on one page.

Sources

  1. Appraisily, “How to Spot Sterling Silver Hallmarks Fast: Estate Sale Checklist,” January 2026. ↩

  2. u/bearybestfriend, “Whoa! 10k gold ring for $1.29 is a helluva way to start the day,” r/ThriftStoreHauls, January 28, 2025, reddit.com/comments/1ic4w7d; the racks-versus-cabinet line is the poster’s. The stamp in the photos reads 10KG with faded characters after it; the “10KG means gold filled, or plated” reading is the thread’s top comment, the “fingers crossed for GF over plated!” reply is the finder’s, and nobody in the thread reports a test. ↩

  3. Tool prices per WorthLens, “Inherited Jewelry: How to Find Out What It’s Really Worth,” April 2026 (loupe under $20), and Investopedia (neodymium magnet, “a few bucks”). ↩

  4. “Help Identifying this ring?,” r/JewelryIdentification, December 11, 2025, reddit.com/comments/1pk8cel. The “big gouge… It’s not plated” reading and the “18K HGE (very faint but visible)” correction are two commenters’; a third identified the ring as 18K electroplate set with nephrite jade. ↩