Is 958 the same as BRITANNIA?

Yes. 958, BRITANNIA, BRITANNIA SILVER, .958 all denote the same material — 95.8% silver. Different markets and eras stamp it differently, but the purity is identical.

How much is 958 worth?

Its melt value is the silver spot price × 0.958 × 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.

How do I confirm a 958 stamp is genuine?

Look at the mark under 10× magnification for crisp, even strikes, cross-check the weight-to-volume ratio against the expected density (10.4 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.

* Silver hallmark

The 958 hallmark: meaning, purity & value

Britannia silver (95.84%). Higher purity than sterling. Mandatory UK standard 1697-1720 to prevent clipping of silver coinage; optional since then.

Published May 30, 2026

Quick facts

Metal: Silver
Purity: 95.8%
Fineness: 958/1000
Common regions: UK
Density: 10.4 g/cm³
Standard: ISO 9202

Stamps that mean the same thing

This purity may be struck into jewelry as any of: 958 / BRITANNIA / BRITANNIA SILVER / .958. The mark differs by country and era, but the metal content is identical.

What 958 tells you

Britannia silver (95.84%). Higher purity than sterling. Mandatory UK standard 1697-1720 to prevent clipping of silver coinage; optional since then.

How to value it

The melt value of a 958 piece is silver spot price × 0.958 × 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.

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 958 or an equivalent such as BRITANNIA.
Weigh the piece and estimate its volume — the density should land near 10.4 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

UK Wrought Plate Act 1697
Wikidata Q865987

* Frequently asked

FAQ

Q. Is 958 the same as BRITANNIA?: A. Yes. 958, BRITANNIA, BRITANNIA SILVER, .958 all denote the same material — 95.8% silver. Different markets and eras stamp it differently, but the purity is identical.
Q. How much is 958 worth?: A. Its melt value is the silver spot price × 0.958 × 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 958 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 (10.4 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.

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