Rhodium Plating
/ROH-dee-um/
Definition
An electroplating process where a thin layer of rhodium (a platinum-group metal) is deposited onto jewelry to create a bright white, highly reflective, and scratch-resistant surface.
Rhodium plating is the standard finishing process for white gold jewelry. White gold alloys are naturally slightly yellowish or grayish — rhodium plating gives them their characteristic bright, cool white appearance. Rhodium is one of the rarest and most expensive precious metals (often more expensive per ounce than gold or platinum), but only a microscopic layer (0.75–1.0 microns) is needed. The plating process involves electrochemically depositing rhodium from a solution onto the jewelry surface. Over time (6 months to 2 years depending on wear), the plating wears through, revealing the underlying metal color. Re-plating is a routine service offered by most jewelers for $30–$75. Rhodium is also used on sterling silver to prevent tarnishing, and on platinum to add a brighter white finish.
Usage in the Trade
Rhodium plating is applied to virtually all white gold jewelry, and frequently to sterling silver pieces. It is discussed in the context of white gold maintenance, jewelry care, and metal comparisons.