PURITY
What does 999.9 gold mean? Read fineness marks with the documents
999.9 generally describes gold fineness of 999.9 parts per thousand. Markets also use 9999, 24K and fine-gold wording, but marking conventions vary.
Last updated: 17 September 2026Based on the public sources listed on this page. Final prices and service terms are confirmed when you lock a price or visit the store.
Quick answer
999.9 normally means at least 999.9 parts of gold per thousand. Check the mark together with weight, certificate or packaging information and the dealer’s transaction documents.
How to read the number
Fineness describes metal content. It does not describe weight, brand value or the future buyback price.
24K is common commercial wording; use the stated parts-per-thousand fineness when precision matters.
In-store checklist
Check weight, fineness mark, condition, serial or packaging details, and make sure any certificate matches the item.
- Weight and unit
- Fineness mark
- Brand, serial, certificate and packaging
- Invoice or transaction record