What Does Sterling Mean Stamped on Jewelry?

STERLING is a word mark for the sterling standard: 925 parts per thousand silver, with the remaining 7.5% usually copper for hardness. A piece stamped STERLING makes exactly the same purity claim as one stamped 925 — the difference is convention, not content.

The word itself is old, tied to English coinage since the medieval period, but as a jewelry stamp it is characteristically North American. British silver is not marked with the word; it carries hallmarks instead, chiefly the lion passant struck by an assay office. American makers, who had no assay-office system, adopted the STERLING stamp widely from around the mid-19th century, and the National Gold and Silver Stamping Act of 1906 made it a federal offense to apply the word to metal below the standard. Canada's marking law follows the same convention, so STERLING on its own is a reasonable indicator of US or Canadian origin — useful for dating and attributing vintage pieces, especially alongside a maker's name such as Tiffany, Gorham, or Birks.

Modern manufacturers increasingly combine conventions, stamping STERLING 925 or S925 to satisfy both markets, so the word alone no longer proves age or origin.

As metal, a STERLING piece behaves like any sterling silver: it tarnishes gradually through its copper content, polishes back readily, and carries melt value based on weight and the silver spot price. Earlier American 'coin silver,' marked COIN and about 90% pure, is a related but lower standard worth distinguishing.

Find the STERLING stamp inside ring bands, on clasps and clasp tags of chains and bracelets, on earring posts or backs, and on the reverse of brooches and pendants. On flatware and hollowware it appears on the back of handles or the underside of bases, often with a maker's name. Variants include STERLING SILVER, STER, STG, and combined marks like STERLING 925.