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What is gold-filled?

Gold-filled jewelry components are made with a layer of gold that is mechanically bonded with heat and pressure to another material, usually a base metal like brass. Gold-filled jewelry is more resistant to tarnishing than gold-plated jewelry because the outside layer is thick enough to prevent oxidation of the inner material. To be considered gold-filled, the gold content must be at least 1/20th of the total weight, where the gold itself is no less than 10 karat in purity. Under FTC regulations, the purity (karat) of the gold content must be part of the marking or designation. As an example, a piece of gold-filled jewelry made with 14 karat gold filled could be stamped 14/20 GF.

Gold filled