Base metal is metal that oxidizes easily when exposed to air or moisture. These metals are more common than precious metals such as gold, silver, and platinum, and thus are more widely used when making jewelry supplies. Base metal gets its name because it is often the type of material which precious metal is bonded to. Base metals include aluminum, brass, copper, and nickel. We offer base metal components in silver, gold, rose gold, copper, brass, brass oxide, gunmetal, and black finishes.