I Found an Old Ring — How to Read Its Hallmarks

Step 1: Don’t Panic — Here’s What You’re Looking At

The tiny marks inside a ring band are called hallmarks or stamps. They are not random — they were placed there deliberately by the manufacturer, an assay office, or both. Their purpose is to tell you:

• What metal the ring is made of (gold, silver, platinum, or plated)
• The purity of that metal (how much of it is the precious stuff)
• Who made it
• Where and when it was tested (in countries with compulsory hallmarking)

Not every ring will have all of these. Some may have just a single number. Others may carry four or five symbols. The more marks, the more information you can extract.

Step 2: Where to Look

Hallmarks on rings are almost always stamped on the inside surface of the band. Hold the ring under a bright light and tilt it slowly until you catch the glint of engraved or stamped marks. On wider bands, marks may be spread along the interior surface. On thin bands, they may be crammed together and difficult to read.

If you have a magnifying glass, use it — most hallmarks are under 2 mm tall. A smartphone camera in macro mode can also work surprisingly well. Position the ring on a white surface, turn on your phone’s flashlight, and take a close-up photo. You can then zoom in on the photo to examine the marks at leisure.

Step 3: Common Numbers You Might See

If your ring has a number stamped inside, here is what the most common ones mean:

• 925 — Sterling silver (92.5% pure silver). The most common silver standard worldwide.
• 375 — 9 karat gold (37.5% pure gold). Very common in British and Australian jewelry.
• 585 — 14 karat gold (58.5% pure gold). The most popular gold standard in the United States and much of Europe.
• 750 — 18 karat gold (75% pure gold). High-end jewelry and European pieces.
• 999 or 999.9 — Pure (fine) gold or silver. Rarely seen in rings because pure gold is too soft for everyday wear.
• 10K, 14K, 18K, 24K — Karat stamps used primarily in North America. The “K” stands for karat (the gold purity unit). 24K is pure gold.

Step 4: What Letter Stamps Mean

If you see letters rather than (or in addition to) numbers, here are the most common ones:

• GP — Gold Plated. A thin layer of gold over a base metal core. Not solid gold.
• GF — Gold Filled. A thicker layer of gold mechanically bonded to a base metal. More durable than plating but still not solid gold. Often preceded by a fraction like “1/20 14K GF” (meaning the gold layer is 1/20th of the total weight and is 14K gold).
• GEP or HGE — Gold Electroplated / Heavy Gold Electroplate. Similar to GP but applied via electrolysis.
• SS or STER — Sterling Silver. An alternative to the numeric 925 stamp.
• PLAT or Pt — Platinum. Usually followed by a fineness number like 950 (95% pure platinum).
• EPNS — Electro Plated Nickel Silver. Not real silver at all — it is nickel alloy with a silver coating. Common on vintage cutlery but occasionally found on rings.
• RGP — Rolled Gold Plate. A thin sheet of gold heat-bonded to a base metal. Similar to gold filled but often thinner.

Step 5: British Hallmark Symbols You Might Find

If your ring has small pictorial symbols (as opposed to just numbers or letters), it may have been assayed in the United Kingdom. British hallmarks are among the most detailed in the world. Common symbols include:

• A lion walking sideways (lion passant): Sterling silver, assayed in England.
• A leopard’s head (front-facing): Assayed at the London assay office.
• An anchor: Assayed at the Birmingham assay office.
• A rose: Assayed at the Sheffield assay office (post-1975).
• A castle: Assayed at the Edinburgh assay office (Scotland).
• A single letter in a shield: The date letter — indicating the year of assay. Requires a reference chart to decode.
• Two or three initials in an outline: The maker’s (sponsor’s) mark, identifying who submitted the ring for testing.

For a comprehensive explanation of the British system, see our Complete Guide to British Hallmarks.

Step 6: How to Tell Gold from Gold-Plated

This is the question most people really want answered. Here are the key indicators:

• Check the stamp: Solid gold is stamped with a karat number (10K, 14K, 18K) or millesimal fineness (375, 585, 750) with no plating indicator. If you see GP, GF, GEP, RGP, or HGE alongside the number, it is plated or filled — not solid.
• Look for wear-through: On a plated ring, the gold layer wears away over time, revealing the base metal underneath. Check high-wear areas like the outside of the band, prong tips, and the clasp (if it has one). If you see a different-colored metal showing through, it is plated.
• Weight test: Gold is dense. A solid 14K gold ring will feel noticeably heavier than a gold-plated brass ring of the same size. This is a rough guide, not definitive — but if the ring feels surprisingly light, be skeptical.
• Magnet test: Gold is not magnetic. If a strong neodymium magnet attracts the ring, it contains ferrous metal and is not solid gold. (Note: this test does not work on non-ferrous base metals like brass or copper, which are also non-magnetic.)

For more details on gold purity markings and what they mean for value, see our guide to understanding gold karat marks.

Step 7: When to See a Jeweler

You should visit a professional jeweler or appraiser if:

• The stamps are worn and illegible, even under magnification.
• You suspect the ring contains a gemstone and want it identified.
• The ring appears to be high-karat gold or platinum and you want a value estimate.
• You plan to sell the ring and need a formal appraisal for insurance or estate purposes.
• The ring has unusual or unrecognized marks that you cannot identify using any reference.

Most jewelers will do a quick visual identification for free or a small fee. For a definitive metal analysis, ask for an XRF (X-ray fluorescence) test — this non-destructive scan determines the exact alloy composition in seconds without damaging the ring.

Step 8: How to Photograph Hallmarks for Identification

If you want to share photos online or use our AI mark checker to identify the marks, follow these tips for the best results:

1. Use macro mode. Most smartphones have a macro or close-up mode. Enable it to get sharp focus at close range.
2. Stabilize the ring. Press the ring into a piece of mounting putty, Blu Tack, or a folded cloth so the stamped area faces straight up.
3. Angle the light. Position a bright light source (desk lamp or phone flashlight) at a low angle — about 30 degrees from the surface. This casts shadows into the stamped recesses, making the marks stand out. Direct overhead light flattens the detail.
4. Take multiple shots. Move the light source and try different angles. Hallmarks are three-dimensional indentations, and the best angle varies by piece.
5. Crop and zoom. Share the tightest possible crop of the hallmark area. The more pixels dedicated to the marks, the easier they are to identify.