Whoa! That second pic is really nice!
Neglect will eventually rid yourself of them, but it takes a while. Real story, but not my recommendation.
Some people will recommend using ice at the foot to get it to release.
Blasting the foot with a powerhead.
Hang the rock upside down out of the water, but over a bucket of water.
Personally I gently peel the edge of the foot, also use forceps to cut away at the rock just beneath the foot and essentially chisel a mm of the rock under the foot of the nem and peel back if you can.
Do wear gloves as it won't be pleasant if you touch it.
Good luck! Beautiful nems!
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