Thank you for viewing. 1/20 12k G.F. stamped Weight: 18.5g Gold-filled is a material made by bonding a layer of gold to a core material such as brass with heat and pressure, with gold accounting for approximately 5% or more of the total weight. Unlike gold plating, the layer is thick, making it difficult to peel off, and you can enjoy the shine of real gold for a long time, making it popular for handmade accessories. Gold filled k12 gold