* Gold hallmark
The 9999 hallmark: meaning, purity & value
9999 denotes 99.99% pure gold (four nines), common on Chinese and investment pieces. Melt ≈ full gold spot × grams.
Published May 30, 2026
Quick facts
- Metal
- Gold
- Purity
- 100.0%
- Fineness
- 9999/1000
- Karat
- 24K
- Common regions
- China, Japan
- Density
- 19.3 g/cm³
- Standard
- ISO 9202
Stamps that mean the same thing
This purity may be struck into jewelry as any of: 9999 / 99.99%. The mark differs by country and era, but the metal content is identical.
What 9999 tells you
9999 denotes 99.99% pure gold (four nines), common on Chinese and investment pieces. Melt ≈ full gold spot × grams.
How to value it
The melt value of a 9999 piece is gold spot price × 1.000 × weight (g). A buyer typically deducts 5–15% for assay, refining, and margin, so the cash offer lands just under that figure. Stones and complex settings are usually excluded from the metal weight.
Live calculators: gold karat × weight · item × karat estimates · per-gram hub.
How to check it yourself
- Examine the stamp under a 10× loupe — genuine marks are crisp and evenly struck, not doubled or smeared.
- Confirm the mark reads 9999 or an equivalent such as 99.99%.
- Weigh the piece and estimate its volume — the density should land near 19.3 g/cm³ for this alloy.
- Photograph it in the Jewelry Identifier app to read the metal, hallmark, and any gemstones from the image.
- For a binding result, have an assay office or gemological lab run an XRF purity test.
Sources
- ISO 9202
- Trade hallmark references
* Frequently asked
FAQ
- Q. Is 9999 the same as 99.99%?
- A. Yes. 9999, 99.99% all denote the same material — 100.0% gold. Different markets and eras stamp it differently, but the purity is identical.
- Q. How much is 9999 worth?
- A. Its melt value is the gold spot price × 1.000 × the weight in grams. Buyers then deduct roughly 5–15% for refining and margin, so a quoted buy-back price sits a little below that theoretical figure.
- Q. How do I confirm a 9999 stamp is genuine?
- A. Look at the mark under 10× magnification for crisp, even strikes, cross-check the weight-to-volume ratio against the expected density (19.3 g/cm³ for this alloy), scan it with the Jewelry Identifier app, and — when it matters — have an XRF test done by an assay office or gemological lab.
* Try it
Identify the jewelry in your hand, right now.
Just take a photo — AI reads the metal, gemstone, hallmark, era, and an estimated value range in seconds. First two scans free, no account required.
* Related
Keep exploring
999 hallmark
What the 999 hallmark means: 99.9% silver, how to read it on rings and necklaces, its scrap value formula, and how to tell it apart from look-alike stamps.
K24 hallmark
What the K24 hallmark means: 99.9% gold, how to read it on rings and necklaces, its scrap value formula, and how to tell it apart from look-alike stamps.