Gold filled jewelry can be 10kt, 14kt, 18kt, 22kt, and 24kt. It looks like solid gold since its outermost layer is actually gold, however, it is a harder, more durable, and less expensive option than solid gold. Compared to gold plating or vermeil, gold filled jewelry contains 100% more gold, it is generally safe for wearers with allergies to common metals, and it is tarnish resistant. Gold filled jewelry refers to a process in which a layer of karat gold is heat- and pressure- bonded to a layer of base metal. This process keeps the metal tarnish resistant because it completely covers the surface of the base metal. Gold is generally a soft metal; therefore, it should be worn with care to avoid bending, dents, and scratches.