I found a cool way to recover your Jem10 pickups. *It's not going to last forever, but it will work for a while of playing. *Before you start, understand this will take about 1 hour or more depending on your skills.
Goto your local hobby store and buy that adhesive gold foil. *The store I went to only had gold, but if they have silver I guess that'll work too. *It doesn't matter if you get gold or silver. *If you apply rubbing alcohol to the gold foil it'll turn shiny silver!!! *It's about $6 a sheet but you can make it go a long way. *I don't recall the brand name. *Try the rubbing alcohol technique on a small area of the foil to see if it'll remove the gold BEFORE you start!
Now, cutout a piece about the size of 1/2 the humbucker. *You'll be best to do the humbucker in halfs. *I'd cut it slightly over because you'll want to 'roll' the ends underneath the pickup. *Try this on one of the humbuckers first, because the single coil's a bitch to do *(I'll get more into that later
Once you have the foil cutout, peel the adhesive covering off the foil strip slowly and carefully. *Apply it to the pickup evenly and GENTLY rub out wrinkles. *Cut off any access foil that you may not need. *Remember - you'll need to 'roll' some extra foil under the pickup otherwise you'll have problems with peeling.
Now comes the hard part. *With a VERY sharp exacto knife (kids, get your parents help), you'll need to cut out holes for the pole pieces in a circle, one-by one. *Cut around the outside of the pole housing, there's a small groove there. *If you are having problems finding where to cut, rub your finger over the pickup where the holes holes are located and it'll give you a good outline. *Do not use a dull knife or it'll tear.
Once you finish you should have a gold shiny 1/2 pickup. *If you want, you can dab a little rubbing alcohol on a paper towel and rub it over the gold. *It should remove the gold plating. *Repeat with other side of pickup. *Do the same for the other humbucker.
The single coil is hard to do because of the raised pole pieces. *It's basically the same process, but you need more overlap. *Cutting the holes is the hard part. *Honestly there's no easy way to do this and I don't have any suggestions on it. *Use your skills and try to cut the holes for the pole pieces while you apply the foil. *On my guitar, it took about 3 trys to get it right.
Like I said, it's not going to last forever, but mine has lasted 6 months of playing with minimal wear.
Give it a shot and let me know if you need any more help. *GOOD LUCK!