Short answer. 925 is a fineness, not a brand and not a finish. It means 925 parts silver in every 1,000 — 92.5% silver, 7.5% of a harder metal, usually copper — and that alloy is what the word sterling has meant for centuries. The stamp records the recipe of the metal the piece is made from, all the way through. It does not describe a coating, and it says nothing about who made the piece or how well.
What the number actually records
Fineness is expressed in parts per thousand. Pure silver is 999. Sterling is 925. The missing 75 parts are the alloy, added because pure silver is too soft to hold a clasp, a claw setting or a ring shank in any useful way — it bends, and a bent claw loses a stone.
So the alloy is not a dilution of the good stuff. It is the reason a piece functions. A 999 chain would kink at the first knot; a 925 chain will not. That trade — a little purity for a great deal of strength — is the whole design of sterling, and it has been the standard for silverware and jewellery long enough that most of the world's silver is made to it.
The fineness ladder
| Mark | Silver content | Usually called | What it is for |
|---|---|---|---|
| 999 | 99.9% | Fine silver | Bullion, some hand-formed pieces. Very soft, marks easily. |
| 958 | 95.8% | Britannia silver | A British standard, mostly silversmithing rather than jewellery. |
| 925 | 92.5% | Sterling silver | The jewellery standard. Hard enough to set stones and hold a clasp. |
| 800 / 835 | 80% / 83.5% | Continental silver | Common in older European cutlery and antique pieces. More copper, so it warms in colour. |
| No fineness mark | A coating only | Silver-plated | A silver layer over another metal. A surface, not a core. |
That last row is the one worth reading twice, because it is the distinction the number exists to make. "925" and "sterling silver" describe the metal the whole piece is made of. "Silver-plated" describes a layer on top of something else. Those are different objects at different prices, and the fineness mark is how you tell them apart in a second.
What a stamp is worth in Australia
In the United Kingdom, a fineness mark is part of a legal hallmark: the metal is independently assayed and struck by an assay office, and the mark carries the office, the fineness and a date letter. Australia has no equivalent compulsory system. Marks here are applied voluntarily by the maker, which means a 925 stamp is a claim rather than an independent test.
That does not make it meaningless. Under Australian Consumer Law a business cannot make a false or misleading representation about what goods are made of, so a brand that stamps 925 on a piece is on the hook for it. But the enforcement sits in consumer law rather than in an assay office, and the practical consequence is simple: the mark is only as good as the maker behind it. Which is why a published material standard, in the same words on every page, is worth more than a stamp you need a loupe to read.
Why sterling darkens, and why that is not a fault
Both metals in the alloy react with sulphur compounds — in ordinary air, in sweat, in wool, in rubber bands, in some cosmetics. The reaction builds a thin film on the surface: straw at first, then grey, then near-black on a piece shut in a drawer for a year. It is a surface film, not corrosion. The silver underneath is untouched, which is why a darkened chain comes back and a scratch does not.
Sydney speeds it up. Humidity and coastal air both help the reaction along, so a piece left on a bathroom shelf here dulls faster than the same piece in a dry cupboard inland. A silver polishing cloth reverses it in under a minute, and the full method is set out here, including the one place that cloth must never go.
The white finishes
Some sterling is plated in a white metal — platinum or rhodium — to hold a brighter, cooler white and slow that reaction at the surface. The piece underneath is still 925; the finish is an extra layer over it. Ours say so on the page when it applies, and a plated white finish changes the care instructions, because a polishing cloth designed to remove a surface layer will remove that one too.
925 and stones
Sterling is the natural setting metal for a bright white stone, because it is hard enough to hold a claw and pale enough not to tint what it holds. Étoilée here is solid 925 sterling silver set with brilliant-cut moissanite: the Équinoxe Halo Ring puts a halo around a 7.8 mm centre stone on a 3.2 mm shank, and the Rivière Tennis Bracelet runs a continuous line of 4 mm rounds along 180 mm of sterling. In both, the metal is doing structural work — a tennis line has to flex without loosening a single setting — and 925 is the fineness that lets it.
Where 925 sits under gold
The other place the number turns up is under a gold finish. "18K gold over 925 sterling silver" means a solid sterling core with a gold layer on top — the sterling is the piece, the gold is the surface. That is why gold over sterling ages differently from gold over brass: when the layer eventually thins at a friction point, what shows is a precious metal that polishes, and the piece is worth re-plating. The words for each construction, and what separates plated from vermeil from solid, are set out in our Australian guide to gold-plated, vermeil and solid gold.
Every standard Amaurine builds to is published in the same wording on every page it applies to, karat and base metal named. Style needs no occasion, and neither does a piece of metal you can read.
Questions
What does 925 mean on jewellery?
It is a fineness: 925 parts silver in every 1,000, or 92.5% silver with 7.5% of a harder metal, usually copper. That alloy is sterling silver. The number describes the metal the piece is made from throughout, not a coating on the outside.
Is 925 silver real silver?
Yes. Sterling is 92.5% silver, and the remaining 7.5% is there to make the metal workable. Pure silver at 999 is too soft to hold a clasp or a claw setting, so nearly all silver jewellery is made to the 925 standard rather than to fine silver.
What is the difference between 925 sterling silver and silver-plated?
Sterling is solid: the same 92.5% alloy from the surface to the centre. Silver-plated is a thin silver layer bonded to a different base metal underneath. A fineness mark such as 925 belongs to solid metal, so a piece described as plated will not carry one.
Does 925 silver tarnish?
It darkens, which is different from corroding. Silver and copper both react with sulphur compounds in air, sweat, wool and rubber to form a thin surface film. The metal beneath is unaffected and a silver polishing cloth takes the film off in under a minute. Humidity and coastal air speed the reaction up.
Is 925 silver hallmarked in Australia?
Not in the British sense. Australia has no compulsory assay-office hallmarking, so a 925 mark here is applied voluntarily by the maker rather than verified independently. Australian Consumer Law still prohibits a false representation about what goods are made of, so the claim is enforceable — it just rests on the maker that makes it.
Is 925 sterling silver good for everyday wear?
It is the standard for exactly that reason. Sterling is hard enough to hold a stone setting and a working clasp through daily wear, soft enough to be resized and repaired by any jeweller, and a precious metal all the way through, so a worn or darkened piece can be brought back rather than replaced.
