The designations “925” and “950” refer to legally defined minimum silver content levels expressed through the millesimal fineness system. In 925 silver, at least 92.5% of the alloy must be pure silver. In 950 silver, the minimum silver content rises to 95%. The remaining percentage consists of other metals that provide structural stability and workability.
Because 950 contains a higher proportion of pure silver and a lower proportion of strengthening alloying metals, it is generally softer and more malleable than standard 925 silver when formulated in traditional copper-based systems. This increased malleability makes 950 particularly suitable for certain forms of handmade fabrication, where controlled deformation and shaping are essential.
Historically, silver alloys were produced primarily with copper as a secondary metal. Copper increases strength compared to fine silver, but also influences oxidation behaviour and surface reaction. Modern production may use master alloy blends designed to adjust hardness, casting performance, or tarnish characteristics while still meeting 925 or 950 purity requirements.
Silver content influences mechanical behaviour, but it does not alone determine final performance. Two pieces stamped 925 may behave differently. The same can apply to two stamped 950 pieces, depending on alloy composition and fabrication method.