when all of the gems are back in place by using the infernal magnet skill, you should still get 3 stars. It's really annoying if you have all gems in the cave, but still get penalized for letting an enemy get to them.
wut? i got armor that was called "mithril scale armor", looked like adamant long chainmail, had the description "shiny and durable adamant scale armor and had 12 def+4 armor...
use the export save game feature if your saves are vanishing. are you using chrome by chance?