Hallmark & Stamp Reader

How the Hallmark Reader Works

Snap a photo of the tiny stamp inside your ring, on a clasp, or behind a pendant. The AI reads the engraving, identifies the marking type, and translates it into plain English. "750" becomes "18K gold, 75% pure." A small anchor symbol becomes "tested in Birmingham, England."

The reader handles karat marks, fineness numbers, platinum stamps, silver hallmarks, plating indicators (GP, GF, HGE), maker's marks, and assay office symbols from the UK, France, and other countries.

Common Stamps You'll Find

Gold jewelry is typically stamped 375 (9K), 585 (14K), or 750 (18K). Silver uses 925 (sterling). Platinum shows PT950 or PLAT. If you see GP, GF, or HGE, the piece is gold-plated, not solid gold.

For a complete reference to every mark and what it's worth, browse the jewelry hallmarks directory. Our detailed hallmarks reading guide walks through how to find and interpret these markings step by step.

Photo Tips for Stamps

Jewelry stamps are tiny, so getting a clear photo matters. Place the piece on a flat white surface and use your phone's macro mode or pinch-to-zoom. Natural daylight without flash works best. For stamps inside ring bands, tilt the ring to let light reach the engraving. Even a partial stamp often gives the AI enough to identify the metal and purity.

Frequently Asked Questions

What jewelry stamps can this tool read?

The AI reads gold karat marks (10K, 14K, 18K, 24K), fineness numbers (375, 585, 750, 925, 950), platinum stamps (PT950, PLAT), silver marks (925, STER), plating indicators (GP, GF, HGE), maker's marks, assay office symbols, and country of origin marks.

How do I photograph a jewelry stamp for the reader?

Place the jewelry on a flat white surface. Use your phone's macro mode or zoom to get as close as possible. Natural daylight works best. For stamps inside ring bands, angle the ring so light reaches the engraving.

What does 925 mean on my jewelry?

925 means sterling silver: 92.5% pure silver mixed with 7.5% other metals for strength. It's the global standard for silver jewelry. If a gold-colored piece is stamped 925, it's likely gold-plated or gold-vermeil over sterling silver.

Is the hallmark reader free to use?

Yes. Upload a photo of your jewelry stamp and get an instant translation of what it means. No account or payment required.