925 silver is a hallmark stamp meaning a piece contains 92.5% pure silver and 7.5% other metals, most commonly copper. The number refers to parts per thousand: a ring marked 925 is 925 parts silver out of 1,000 total. This is the globally recognized standard for sterling silver and the minimum silver content required for a piece to be sold as sterling in the United States and most international markets. You will find the stamp inside ring shanks, on the back of pendants, and on the clasp area of bracelets and chains – either as “925,” “S925,” or “.925.”
Pure silver (999 fine) is too soft for most jewelry applications. The 7.5% alloy addition – typically copper – increases hardness and durability without materially changing color or appearance. Copper does, however, make the metal reactive: it is the copper content that causes 925 silver to tarnish when exposed to air, sulfur compounds, and skin chemistry. Gold fill, vermeil, and base metal pieces can look similar to sterling, which is why the 925 hallmark is the reliable way to verify what you actually have. If a piece has no stamp, metal testing can confirm or rule out sterling content.
Sterling silver can be rhodium plated to resist tarnish and give it a white gold appearance, or gold plated for a yellow or rose finish. When a 925 silver ring needs sizing or reshaping, the relative softness of the alloy makes the work straightforward for an experienced jeweler – silver responds well to heat and file work, and solder blends cleanly with the base metal. Where 925 pieces require extra care is in plating: if a silver ring has been rhodium or gold plated, resizing or polishing removes the plating at the work site and the piece will need replating after the repair to restore a uniform finish. QJR handles both the repair and the replating as part of the same service.