A good question, although you could just as fairly ask why Iron is. There
aren't very many matierials that are attracted to magnets in thier elemental
forms, there are even a few that are repelled by a magnetic field! Gold in
Jewlery is often plated over a less expensive metal, but these are typicly
also not metals attracted to magnets. In it's refined form, there are so
few impurities present that only the gold (and it's lack of attraction to
magnets) remains.
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