What Does 333 Mean on Gold?
Stamps describe metal content; they are not a buy/sell quote. When in doubt, test with a jeweler or assay service.
33.3% pure gold — minimum in some European countries
If you’re selling, use the stamp to pick the right karat rate—then compare buyer offers as a percentage of melt, not headline spot.
Common confusion points
- Fineness stamps like 333 describe alloy purity, not resale price—buyers still apply their own payout percentage.
- If the piece is filled/plated, you may see extra marks like GF/GP/HGE that change the interpretation.
Similar / easily-confused stamps
This stamp corresponds to 8K — about 33.3% gold content by weight.
Common in: Germany, Austria, Eastern Europe. Typical items: Budget jewelry, Vintage European pieces.
This fineness shows up often in pieces sold for or imported from Germany, Austria, Eastern Europe—always match the stamp to what you actually weigh.
Illustrative: at the USD spot used on this site, 10 g of 8K gold has a rough melt around $483.30 (not an offer).
Verification tips
- Magnets can catch obvious fakes but can’t prove purity (some base metals are non-magnetic).
- Look in high-wear areas (inside rings, near clasps). Worn stamps can be incomplete or misread.
- If the piece is plated, you may see marks like GP, GF, HGE—those are not solid-gold fineness stamps.
Gold Value Calculator
Adjust this price to project a future value. 24K per troy oz.
Total gold value$483.30
Current 8K price • $48.33/gram • $1503.23/oz
Formula: weight × karat multiplier × spot price. 14K = 0.585, 18K = 0.75, 10K = 0.417.
Same USD spot basis as the estimates on this page. Adjust weight, unit, or karat to explore scenarios.
333 gold — melt by weight (USD, reference)
Same spot basis as the calculator above. Full metal value only—not stones or labor.
| Weight | Approx. melt |
|---|---|
| 1 g | $48.33 |
| 2 g | $96.66 |
| 5 g | $241.65 |
| 10 g | $483.30 |
| 20 g | $966.60 |
| 50 g | $2,416.50 |
Where you'll see the 333 stamp
Check inside ring shanks, near necklace and bracelet clasps, on earring posts or backs, and on small tags. Stamps can be tiny—use bright light or a loupe if the punch is worn.
How to verify a stamp
Stamps can wear down or be wrong. A jeweler can do an acid scratch test or XRF; a magnet won't stick to solid gold, but it isn't proof of purity on its own. For high-value pieces, use a buyer you trust or an independent assay.
Related links
FAQ
- What does 333 mean on gold?
- 333 is a fineness stamp. For gold jewelry it means 8K (33.3% gold content in the alloy). 33.3% pure gold — minimum in some European countries
- Is 333 the same as 8K?
- Yes—333 on gold corresponds to 8K purity. Regional stamping styles differ, but the gold fraction is the same idea.
- Does a 333 stamp guarantee real gold?
- Not always. Stamps can be worn, incomplete, or misapplied, and counterfeit marks exist. If value is significant, confirm with a jeweler (XRF) or a trusted buyer before you sell.