Gold overlay clasps are a great choice for making gold jewelry, and these precious metal magnetic clasps work especially great on bracelets because they're so easy to close! Choose from MAG-LOK button-style clasps and sliding tube magnetic clasps. Gold fill (aka gold overlay) is a process in which a thick layer of karat gold is fused to a core of less costly metal. Gold fill is 50 to 100,000 times thicker than a gold plating, which is why we consider our gold filled jewelry findings to be precious metal components.