Pure Silver vs Sterling Silver: Why 925 Is the Jewellery Standard

If you are shopping for pure silver jewellery, the answer you are looking for is 925 sterling silver. It is the international purity standard for silver jewellery — the grade assay offices hallmark, the grade jewellers work in worldwide, and the mark to look for on anything you actually intend to wear.

What "pure" means when you are buying jewellery

Most people searching for pure silver are asking one question: is this real silver, or is it plated? That is the distinction that decides what you get. Silver-plated jewellery is a thin skin of silver over brass or another base metal, and it wears through to show the metal underneath. Solid 925 sterling silver is silver all the way through — the same metal at the surface as at the core. By the measure that matters on a shop page, 925 is pure silver jewellery.

Why 925 is the standard the world hallmarks

Sterling silver is stamped 925 because it is 92.5% silver combined with 7.5% of another metal, almost always copper. That is not a shortcut or a dilution — it is a deliberate specification that has defined sterling for centuries. Silver on its own is a soft metal. The small amount of copper is what lets a piece hold its shape, hold a stone securely, and survive years of being worn, taken off and put back on.

This is why 925 is the number recognised internationally: it is the purity grade assay offices test against and hallmark for jewellery. In India it sits within the Bureau of Indian Standards hallmarking scheme; in the United Kingdom it is the sterling standard the assay offices have certified for generations.

Where 999 fine silver actually goes

Silver at 99.9% purity — stamped 999 and called fine silver — does exist. It is used mainly for coins, bars and some ceremonial pieces, where metal is valued by weight and never has to withstand daily wear. It is rarely used for rings, earrings or chains, because at that purity the metal bends and marks far more easily than most people expect. Choosing 925 for jewellery is not settling for less purity than you could have had; it is choosing the grade designed for the job.

What to check on the piece itself

Look for the 925 stamp — on an earring post or back, inside a ring band, or on a clasp. A hallmark from a recognised authority carries more weight still, because it is issued independently rather than claimed by the seller. HighSpark is a BIS-certified jeweller, and our silver is independently tested by the Sheffield Assay Office (UK), so the purity is confirmed by a third party rather than by us.

Why the rest of the alloy matters

What the other 7.5% is made of matters as much as the number stamped on the piece. A hallmark certifies the silver content; it says nothing about what else is in the mix. Those are separate questions with separate tests, and the strict answers come from UK and European rules: cadmium must stay below 0.01% by weight and lead below 0.05%, with nickel limited not by how much is present but by how much transfers onto skin over a week of wear.

Our 925 silver is tested against that standard by the Sheffield Assay Office (UK), which is what nickel-free, cadmium-free and lead-free actually rests on. Indian hallmarking answers the purity question well; it was never designed to answer this one. Every piece across our silver stud earrings, silver hoop earrings and silver rings is made to that same 925 standard.