Gold filled is a popular term used in the jewelry industry to describe a layer of gold that has been bonded to a base metal. This layer of gold is thicker than gold plating, making it more durable and long-lasting. However, there are many synonyms for gold filled that are used interchangeably. Some of these synonyms include gold overlay, rolled gold, gold bonded, and gold-dipped. These terms all refer to the same process of applying a layer of gold to a base metal. When shopping for jewelry, it's important to understand the different terms used to describe the quality of the piece to make an informed decision.