If one goes back in this thread, I think I have said this before, but it seems to be worth repeating.
Metal detectors are based on the principal of inductance. To over simplify: metals that reflect a magnetic field. To really over simplify: it detects thing that a magnet will stick to. So, with all quality jewelry being non-magnetic it will not make a fuss. If you buy and/or wear jewelry from Hot Topic, get ready for an "enhanced search".
If there are no spelling mistakes above, I am on my computer. Otherwise, I'm on my droid phone and I apaullagyze for my atroughshush spelling.