Hallmarks: What 925, 14K and PT950 Actually Mean

Three characters inside a band can tell you the metal content, the country of origin, and whether the seller's description matches the object. Here is how to read them — and what a missing mark does and does not mean.

What a hallmark actually is

A hallmark is a stamp struck or laser-engraved into jewelry that declares its metal content. The word comes from Goldsmiths' Hall in London, where English silver has been tested and marked since the fourteenth century. The practice spread because that claim is easy to make and hard to verify.

So a hallmark is a statement of composition — not a brand, not a certificate, and not an indication that anyone checked the piece for quality.

925: what sterling silver means

925 means 92.5% silver. The remaining 7.5% is almost always copper, added because pure silver is too soft to hold a setting or survive daily wear.

You will see it written as 925, S925, Sterling, Ster or Ag925 — all the same thing. S925 is most common on Asian-manufactured jewelry, 925 alone on European pieces. What it does not tell you is whether the piece is solid or hollow, because the stamp describes the alloy, not the construction.

The karat stamps, in both systems

Gold is stamped either as a karat count or as a millesimal fineness — parts per thousand.

The last row is the one to watch. "14K gold plated" is base metal with a microscopic gold layer. Gold filled is thicker and more durable, but still not solid gold.

PT950 and the platinum marks

PT950 means 95% platinum. You will also see PT900 and, rarely, PT850. The letters are the element symbol; the number is purity in parts per thousand. Older pieces may carry only "PLAT" with no number.

Platinum stamps matter more than most: a white gold ring and a platinum ring look identical in a photo, and the price difference is large. If the stamp does not say PT followed by a number, the piece is not platinum.

Where marks are placed

• Inside the ring band, usually opposite the setting; on a narrow band, on the outer shank near the base.
• On the clasp or tag — jump ring, lobster claw, or a small flat tag.
• On the post or the earring back; small studs often carry the mark on the scroll rather than the earring.

Because of where they sit, marks wear: a ring worn daily for twenty years can have its stamp rubbed to a shadow. A worn mark is not evidence of a fake.

Why a hallmark is not a quality grade

A 925 stamp says the alloy is 92.5% silver. It says nothing about whether the setting is secure, the prongs thick enough, the stone what it claims, or the piece likely to survive a year. Two 925 rings, both correctly stamped, can differ by a factor of ten in construction quality.

The stamp is a floor, not a rating: it answers what the piece is made of, and the rest is judged from the setting, the weight and the finish.

What it means when there is no mark

Absence is not proof of fraud. Legitimate reasons: the piece is too small for a legible stamp, it predates mandatory marking, it was re-sized and the stamped section removed, or it was made for a market with different rules. The United States has no mandatory assay system, so American pieces often carry only a maker's mark and a karat stamp, or nothing.

The honest position: no mark means you cannot verify composition from the object, so you are relying on the seller. The check is simple — read the claimed metal, find the stamp in the photos, translate it to a percentage, compare. If the listing will not show the mark, ask.

Italy, Britain, and China: three systems

Italy marks by maker rather than by assay. Pieces carry a registered manufacturer's mark — a star, a number and a two-letter province code — plus the fineness. There is no government assay office testing each piece, so the mark identifies who is accountable rather than certifying the alloy.

Britain has the most elaborate system: a sponsor's mark, the assay office mark (London, Birmingham, Sheffield or Edinburgh), a date letter, and a fineness mark. Each piece is tested before the mark is applied, which is why they are strong evidence of composition.

China uses national standards with its own vocabulary. Silver is marked S925, or 足银 for high-purity silver. Gold uses 足金 at or above 990 parts per thousand, with K gold marked 18K, 14K or the millesimal equivalent. Platinum is marked 铂950 or PT950. Export pieces usually carry both the Chinese mark and the Western equivalent.

What we make

Every piece we sell is stamped with its metal content — S925 or 925 on silver, 375, 585 or 750 on gold — and we list the same information in the description so you can check one against the other. Our factory in Wuzhou, Guangxi has been producing since 2008, so the stamp and the object come from the same place.

Moissanite is D colour VVS1 with a GRA certificate; lab grown diamond comes with IGI. Prices run $17 to $2,020, median around $98. Free shipping over $99, $5.99 below, and 30 days to return anything unworn in its original packaging.