18k gold-filled earrings are a type of jewelry that is made by bonding a thick layer of 18-karat gold to a base metal core, typically made of silver or brass. This process involves mechanically bonding the gold layer to the base metal through heat and pressure, ensuring a strong and durable connection.
Gold-filled jewelry offers a more cost-effective alternative to solid 18-karat gold while providing a similar appearance. This makes it an attractive option for those seeking the look of fine gold jewelry without the high price.