Gold-filled jewelry is composed of a solid layer of gold which must constitute at least 5% of the item's total weight, mechanically bonded to a base metal. Our gold-filled earrings are cut from a sheet of 14k gold bonded to brass. The front and back of the earring will be coated in 14k gold. The edges of the earrings will have exposed base metal and can tarnish over time. Those with high sensitivity should purchase solid 14k gold.