Rhodium Plating
Rhodium plating is a process where a thin layer of rhodium (a precious metal in the platinum family) is electroplated onto jewelry, most commonly white gold, to create a bright white, reflective finish.
This plating serves two purposes: it gives white gold its bright white appearance (as white gold is naturally a bit grayish) and provides a durable, scratch-resistant, hypoallergenic surface. Rhodium is extremely hard and reflective, creating jewelry's signature mirror-like finish.
Rhodium plating eventually wears away with daily wear, typically lasting 12-18 months depending on use. Jewelry should be re-plated periodically to maintain its bright white appearance. Most white gold engagement rings and wedding bands are rhodium plated.