- Jewelry Identifier
- Hallmarks
- PURPLE GOLD
* gold-alloy-modifier hallmark
The PURPLE GOLD hallmark: meaning, purity & value
Purple gold (Au-Al intermetallic compound AuAl2). 79% gold by mass approximately equivalent to 18K. Extremely brittle (cannot be cast as a structural ring), used as inlay or accent stones.
Published May 30, 2026
Quick facts
- Metal
- gold-alloy-modifier
- Purity
- 75.0%
- Fineness
- 750/1000
- Common regions
- international
Stamps that mean the same thing
This purity may be struck into jewelry as any of: PURPLE GOLD / AMETHYST GOLD / AuAl2. The mark differs by country and era, but the metal content is identical.
What PURPLE GOLD tells you
Purple gold (Au-Al intermetallic compound AuAl2). 79% gold by mass approximately equivalent to 18K. Extremely brittle (cannot be cast as a structural ring), used as inlay or accent stones.
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 PURPLE GOLD or an equivalent such as AMETHYST GOLD.
- 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.
* Frequently asked
FAQ
- Q. Is PURPLE GOLD the same as AMETHYST GOLD?
- A. Yes. PURPLE GOLD, AMETHYST GOLD, AuAl2 all denote the same material — 75.0% gold-alloy-modifier. Different markets and eras stamp it differently, but the purity is identical.
- Q. How do I confirm a PURPLE GOLD 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, scan it with the Jewelry Identifier app, and — when it matters — have an XRF test done by an assay office or gemological lab.
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