Sterling silver is composed of 92.5% pure silver, while 18K gold-plated sterling silver refers to sterling silver that is coated with a layer of 18K gold. 18K gold is a premium, durable and luxurious material. When 18K gold plating is applied to sterling silver, it not only enhances the piece’s luster and elegance but also provides extra protection, making it more resistant to tarnishing and daily wear.