Jewelry described as one metal over another signifies a base metalin this context, sterling silvercoated with a thin layer of rhodium. Sterling silver is an alloy composed of 92.5% pure silver and 7.5% other metals, typically copper. Rhodium, a rare and expensive platinum-group metal, is electroplated onto the sterling silver to enhance its properties. An example of this application is found in rings, necklaces, and earrings where a brighter, more durable finish is desired.
The practice of applying a rhodium finish to silver serves several key purposes. It imparts a high level of reflectivity, creating a brilliant, white appearance that is more lustrous than untreated silver. Furthermore, rhodium provides a protective barrier against tarnish, a common issue with silver alloys due to their copper content’s reaction with sulfur in the environment. Historically, this plating process has become increasingly popular as a way to maintain the aesthetic appeal of silver jewelry while reducing the need for frequent polishing.
