Updated September 8, 2026 · By Bulawan
Where to find the hallmark
- Rings: inside the band.
- Chains and bracelets: on the clasp or the small tag near the clasp.
- Earrings: on the post or the back.
- Pendants: on the bail (the loop) or the back.
Common gold stamps
| Stamp | Meaning |
|---|---|
| 999 / 24K | 99.9% pure gold |
| 916 / 22K | 91.67% gold |
| 875 / 21K | 87.5% gold |
| 750 / 18K | 75% gold |
| 585 / 14K | 58.5% gold |
| GP, GEP, HGE, RGP | Gold plated — very little gold |
| GF, 1/20 12K | Gold filled — thin gold layer bonded to base metal |
| 925 | Sterling silver, not gold (may be gold-plated, 'vermeil') |
Important caveats
- A stamp can be faked. Buyers always confirm purity with an acid or XRF test.
- Old or worn pieces may have no visible hallmark yet still be real gold.
- Some countries stamp 'KP' (karat plumb) to certify exact purity.
Frequently asked questions
- What if my gold has no hallmark?
- It may still be real gold. A jeweler, pawnshop, or gold buyer can test it with acid or an XRF machine in minutes.
- Does '18K GP' mean 18 karat gold?
- No. GP means gold plated. The item has only a thin layer of 18K gold over base metal and has little resale value.
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