Rhodium, a rare and expensive metal, is responsible for this plating, making the jewelry waterproof. Rhodium-plated silver jewelry lasts longer than traditional silver due to its protective layer, reducing tarnishing by up to 10 times. It's hypoallergenic, minimizing skin reactions, and enhances the jewelry's appearance, giving it a bright, reflective surface akin to white gold, boosting its desirability and versatility.