Earrings are nonmagnetic. Typically they are made from either gold or sterling silver, not iron-based metals.
This is the same reason that medical devices such as a plate I have in my left arm does not set off metal detectors. The plate in my arm is made of a titanium-based alloy that contains no iron.
Metal detectors are basically big magnets looking for something that reacts to the magnetic field
Earrings and other jewelry don’t contain much ferrous (magnetic) metals because ferrous metals rust and are more expensive than the cheap costume jewelry metals
Alternatively expensive earrings contain gold which is not magnetic, cheap diluted gold will be detected by metal detectors
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