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You could either go all day digging low numbers on the equinox hoping against hope to find a 1 gram gold chain that the excal maybe couldn't find...
Yes, there is the "devil in the details" about the micro-jewelry ability : There's a few downsides to "knocking yourself silly to not-miss micro-jewelry" :
a) if you're trying such a stunt in the dry sand area of the beach (especially dry sand that's been above all high-water movement for decades), be prepared for an avalanche of ttteeennnnsssyyy foil turd cr*p.
b) Even once you finally get your prize earring stud and/or tinsel thin chain, you'll have almost nothing, gold-wise, to show . Ie.: It would take 50 such earring studs or tinsel thin chains, to equal the weight of a single ring. Yes I know it's the sport of the hunt that counts , but .... realistically .... who cares ?
About the only time when I've ever wished I had ability for micro-jewelry, was one time when I was on a commissioned hunt to help a lady find a dainty tinsel thin chain, with a hefty finders-reward. Other than that, I've never missed the ability. If your machine is that "hopped up" to find such small things, then , as said, be prepared for some downsides.
Note: Possibly on the wet sand, after erosion, there's no "foil-turds" to bother you, then yes, it would be nice to have something that more sensitive to teensy stuff. Since theoretically, light gold chains are still there, while mother nature has removed all the light stuff.