The propensity of jewelry to discolor skin, specifically leaving a green mark, is often attributed to the metals comprising the piece. While silver itself is generally inert, the presence of other metals in silver alloys, most notably copper, can react with moisture and acids on the skin, leading to the formation of copper salts, which produce a green stain. Jewelry crafted from sterling silver, indicated by a .925 stamp denoting 92.5% pure silver and 7.5% other metals (typically copper), can still, under certain conditions, cause discoloration.
The desirability of silver alloys that minimize skin discoloration stems from both aesthetic and practical considerations. Discoloration can detract from the beauty of the jewelry and be perceived as a sign of poor quality. Historically, concerns about skin reactions to jewelry have influenced the development of alternative metal alloys and surface treatments aimed at reducing the likelihood of such effects. The selection of appropriate alloys can enhance the longevity and wearability of jewelry.
