The collection is made with gold-filled. This is different than gold plated as it is 100 x thicker than gold plating. This is the best alternative to solid gold as the top layer has a thicker 14K  layer that is bonded with heat  and pressure to the base metal. The thickness of the 14K gold assures a long life. This material tarnishes, as does gold but can be cleaned just like one cleans sterling silver.