CuriSnap marks and hallmarks field guide
375, 585 and 750 gold marks: fineness, karat equivalents and limits
Gold marks 375, 585 and 750 state parts of gold per thousand: 37.5%, 58.5% and 75.0%. They are commonly associated with 9, 14 and 18 carat gold respectively. The number does not identify the maker, production date, country or authenticity of the stamp.
What do 375, 585 and 750 mean?
Divide the number by ten to express the claimed gold percentage. Keep the number’s shield and neighboring marks in the photograph.
How should gold marks be photographed?
Photograph the entire object first, then the complete mark group, then a sharp close-up from a second light angle. Record dimensions separately. Preserve the original file; do not polish, scrape or retouch a mark to make it easier to read.
| Evidence | What to record | Research limit |
|---|---|---|
| Mark | Claimed gold proportion | Common karat description |
| 375 | 37.5% | 9 carat |
| 585 | 58.5% | 14 carat |
| 750 | 75.0% | 18 carat |
Is 585 always exactly 14K?
585 means at least 585 parts gold per thousand under the applicable marking system. “14K” is a related karat description; tolerances and legal rules depend on market and period.
What can a gold fineness mark prove?
A photographed mark is evidence to research, not a certificate. A mark alone cannot prove authenticity, exact age, maker attribution, precious-metal content, condition or market value. Compare the complete object with documented records and obtain an in-person test when the decision depends on material or authenticity.
How should value be researched?
Separate metal value from workmanship, maker, stones, condition and resale market. Obtain an actual weight and appropriate test before any bullion calculation.
Primary references
- British Hallmarking Council: Hallmarking practical guidance
- U.S. Federal Trade Commission: Buying platinum, gold, and silver jewelry
References support the stated systems and documented examples. They do not endorse CuriSnap or authenticate a reader’s object.
Frequently asked questions
Can 375, 585 and 750 gold marks authenticate an object?
No. A photograph and reference comparison can narrow a research question, but authentication and material testing require appropriate examination of the object.
What photograph should I take first?
Take one sharp photograph of the entire object, followed by the complete mark group and a close-up from a second light angle.