What does 958 mean on jewelry?
Short answer
958: 958 parts per thousand silver.
A mark is a statement, not proof: it can be forged or struck on a plated piece. An assay confirms it (touchstone and acids, or X-ray fluorescence).
The stamp in detail
| Item | What the tables say |
|---|---|
| Stamp | 958 |
| Class | Fineness (purity) mark |
| Silver fineness | 958 parts per thousand (95.8 % silver) |
| Legal standard (silver 958) | United Kingdom, Vienna Convention states |
| Note | Britannia silver (958.4). |
| Source check | Checked against the sources listed below |
What is 958 worth by weight?
Every gram of a piece stamped 958 holds 0.958 g of fine silver, if the stamp is accurate. Multiply that by the spot price of silver to get the melt value. It is the floor, what the metal is worth if melted, not what a buyer will pay and not an appraisal.
Example, clearly not live: 10 g at the example price of $51.87 per troy ounce (snapshot of 2026-11-10) is $15.98. The working: 10 g → 958 / 1000 → 10 g × 0.958 → 51.871 USD/ozt ÷ 31.1034768 g/ozt → 9.58 g × 1.6677 USD/g.
Melt value calculator for 958
Enter a weight and a stamp to see the sum.
Today's spot price: LBMA precious metal prices, Kitco live gold or your own dealer's quote. This page never contacts a price service.
What 958 can be mistaken for
Pieces that look like silver and are not:
- silver plate (EPNS)
- alpaca, nickel silver
- white gold and platinum
What a stamp cannot settle: Silver, white gold or platinum without marks: white colour does not tell them apart.
What settles it:
- Jeweller: acids or X-ray fluorescence.
Related stamps
Frequently asked
What does 958 mean on jewelry?
958: 958 parts per thousand silver.
Does 958 mean the piece is solid silver?
It means the piece is stamped as silver, 958 parts per thousand. A mark is a statement, not proof: it can be forged or struck on a plated piece. An assay confirms it (touchstone and acids, or X-ray fluorescence).
How much fine silver is in a piece stamped 958?
0.958 g of fine silver per gram of metal, if the stamp is accurate. Melt value is that weight times the spot price. It is not an appraisal.
Sources
- Hallmarking Act 1973, Schedule 2 (revised text)
- Vienna Convention on precious metals, Technical Decisions Rev. 13 (in force 1 Oct 2026)
All sources are listed with the method on the sources page.