Why We Use Only 925 Hallmarked Sterling Silver

Published: June 4, 2026 | Reading Time: 8 min Part 12 of the Zalkari 50-Day Silver Guide Series

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We could make jewelry that looks identical to what we sell now for a fraction of the cost. Swap the alloy, skip the testing, drop the hallmark, and most customers would never know the difference — at least not on day one.

We don't do that, and we think it's worth explaining why, because the reasoning isn't really about marketing. It's about what actually happens to a piece of jewelry over the months and years after someone buys it, and what we'd be willing to put our name on.

The 7.5% That Nobody Talks About

Everyone who sells silver jewelry talks about the 92.5%. That's the headline number — 92.5% pure silver, the sterling standard, the part that sounds impressive on a product listing.

Almost nobody talks about the other 7.5%.

That remaining fraction is alloy metal, and it's where the real differences between a good piece of sterling silver and a mediocre one actually live. Pure silver on its own is far too soft for jewelry — it would bend out of shape within weeks of normal wear. The alloy metal is what gives the silver its strength, its structure, its ability to hold a shape and survive being worn on a hand or wrist or ankle every day.

The standard, time-tested choice for that 7.5% is copper. Copper has been used in sterling silver alloys for centuries because it does the job well — it hardens the silver appropriately, it's chemically well-understood, and it's safe for the overwhelming majority of people to wear against their skin.

But copper isn't the only thing that can technically go into that 7.5% and still let a piece carry a 925 stamp. Some manufacturers use nickel instead, or partially instead. Nickel is cheaper in some sourcing markets, and it can make certain casting processes a bit easier. A piece made with a nickel-heavy alloy can still hit 92.5% silver and still wear a perfectly legitimate 925 stamp — because the stamp only certifies the silver percentage, not what the rest of the alloy is made of.

This is the gap we built our entire material policy around closing.

What "925 Hallmarked" Actually Commits Us To

When we say every piece we make is 925 hallmarked sterling silver, here's what that commitment actually involves on our end.

First, every batch of raw silver alloy we bring into production is tested before it's used — not after a finished piece comes off the line, but at the material stage, before any work has been done on it. If a batch doesn't meet 92.5% silver content, it doesn't get used. This sounds like it should be obvious, but it's a step that costs time and money, and it's a step that's easy to skip if nobody's checking.

Second, we control what makes up that other 7.5%. Our alloy uses copper as the hardening agent, not nickel. This is a deliberate choice, and it's one of the main reasons we can say our pieces are nickel-free without qualifications. The 925 stamp tells you the silver content. Our alloy policy tells you what the rest of the metal actually is — and for a meaningful number of people, that second piece of information matters more than the first.

Third, the hallmark itself is applied consistently, in standard positions, with clean dies that produce uniform, legible stamps. A sloppy, oversized, or unevenly pressed stamp is one of the first signs something's off with a piece. Ours are small, clean, and exactly where you'd expect them: the inner band of a ring, the clasp of a necklace or anklet, the post of an earring.

And fourth — this is the part that ties back to our last post — every finished piece is verified to meet this standard before it ships. The testing we described previously isn't a one-time certification for a product line. It's an ongoing process applied to the materials and the output. If you missed that post, it's worth a read: how Zalkari's 925 sterling silver is tested and certified (https://www.zalkari.us/blogs/news/how-zalkari-925-sterling-silver-tested-certified).

Why This Matters More in the US Than You Might Think

Here's something that surprises a lot of US shoppers when they learn about it: unlike some other countries, the United States doesn't have an independent government body that tests and certifies silver purity before a "Sterling" or "925" stamp goes on a piece of jewelry.

In the UK, for example, hallmarking has been a legally mandated, independently verified process for centuries — pieces are sent to an assay office, tested, and stamped by that office, not by the manufacturer. Several other countries participate in an international convention that recognizes each other's hallmarks across borders.

The US isn't part of that system. Under FTC rules, a "Sterling" or "925" stamp is a manufacturer's own declaration. The FTC sets the legal standard — a piece marked sterling silver must be at least 92.5% pure silver — and can take action against companies that misrepresent their products, but there's no independent assay office testing every piece before it reaches a US shopper.

What this means in practice: the 925 stamp on a piece of US-sold jewelry is only as reliable as the company that put it there. There's no third party double-checking it before it gets to you. The responsibility sits entirely with the brand's own quality process — which is either real and rigorous, or isn't.

We think US shoppers deserve to know this, because it changes what the 925 stamp should mean to you. It's not a government guarantee. It's a claim. And the only way a claim like that is worth anything is if there's a genuine process behind it.

What You Get From a Hallmark That's Actually Backed Up

When the 925 stamp on a piece of jewelry is backed by real testing and a deliberate alloy choice, a few things follow naturally.

You get a piece that won't surprise you later. The silver percentage doesn't drift between batches. The alloy doesn't quietly shift to whatever's cheapest that quarter. What you're holding is what the stamp says it is, consistently, piece after piece.

You get a piece that's actually safe for the skin it's worn against. This is the nickel-free point again, and it's worth repeating because it affects a genuinely large number of people. Roughly one in six American women has some degree of nickel sensitivity. A 925 stamp alone doesn't protect against that — but a verified copper-based alloy does. For more on this, our guide on whether sterling silver is hypoallergenic (https://www.zalkari.us/blogs/news/is-sterling-silver-hypoallergenic) goes into the full picture.

You get a piece with real resale and trade-in value, for what that's worth to you. Hallmarked, verified sterling silver has documented purity. If you ever wanted to sell or trade a piece, its silver content isn't a guess — it's a known quantity, which matters for anything involving the actual value of the metal.

And you get a piece that will behave the way sterling silver is supposed to behave over time — tarnishing the normal, reversible way that genuine 925 silver tarnishes, polishing back up the way genuine sterling does, and not doing anything unexpected like flaking, discoloring unevenly, or reacting badly with skin in ways that shouldn't happen with real sterling.

The Honest Tradeoff

We're not going to pretend there's no cost to this approach. Verified, copper-alloyed 925 sterling silver, tested at intake and again before shipping, costs more to produce than an unverified alloy with a stamp pressed on at the end of the line. That cost is reflected in our pricing — we're not the absolute cheapest silver jewelry you'll find online, and we're not trying to be.

What we are trying to be is a brand where the 925 stamp on your jewelry means exactly what it's supposed to mean, every single time, without you having to wonder.

If you want to verify any piece you buy from us, the methods we described previously — the magnet test, checking the stamp under magnification, or taking it to a local jeweler for an XRF reading — all apply. We'd genuinely rather you check than just take our word for it.

Frequently Asked Questions

Is all sterling silver nickel-free? No. The 925 stamp certifies that a piece is 92.5% pure silver, but it doesn't specify what makes up the remaining 7.5%. Some manufacturers use nickel in that portion, which can cause reactions in people with nickel sensitivity. Zalkari's alloy uses copper specifically to avoid this.

Does a 925 stamp guarantee a piece is genuine sterling silver? The stamp is a declaration by the manufacturer. In the US, there's no independent government body verifying it before sale, so its reliability depends entirely on the manufacturer's own testing process. A stamp from a brand with documented testing carries more weight than one from a seller with no transparency about materials.

Why don't more brands talk about their alloy composition? Most of the silver jewelry market focuses on the 92.5% number because it's the legally defined standard and the one shoppers recognize. The composition of the remaining 7.5% isn't required disclosure, so many brands simply don't address it — even though it can matter significantly for skin sensitivity.

How can I check if my existing silver jewelry is nickel-free? The clearest sign is whether it causes a reaction — redness, itching, or a rash where it contacts skin, typically appearing within a day or two of wear. For a definitive answer, a jeweler can test the alloy composition. If you're curious about the broader topic, our guide on whether sterling silver is hypoallergenic covers this in more depth.

Shop Verified 925 Sterling Silver at Zalkari

Every piece is made from 925 sterling silver with a copper-based, nickel-free alloy — tested at intake, hallmarked consistently, and verified before it ships.

Sterling Silver Rings (https://www.zalkari.us/collections/rings) — minimalist bands and stackable styles, nickel-free 925 silver

Sterling Silver Earrings (https://www.zalkari.us/collections/sterling-silver-earrings) — hypoallergenic studs, hoops, and drops, safe for sensitive ears

Sterling Silver Necklaces (https://www.zalkari.us/collections/sterling-silver-necklaces) — dainty layering chains and pendants

Sterling Silver Anklets (https://www.zalkari.us/collections/sterling-silver-anklets) — our most popular everyday category

Sterling Silver Bracelets (https://www.zalkari.us/collections/bracelets) — cuffs, chains, and charm styles

Birthstone Jewelry (https://www.zalkari.us/collections/birthstones) — genuine gemstones in certified 925 silver settings

Moissanite Jewelry (https://www.zalkari.us/collections/moissanite) — moissanite stones in verified sterling silver

Fast shipping across the US. Easy returns. Real 925 sterling silver, every piece, every time.