Miracle is another name to conjure with, apparently. I don't think it's as good as Trifari, though. Dior did costume jewellery, but I think the bottom line in costume stuff is having a name on it at all.
I've got a beautiful Trifari butterfly, but the stones on it are clear cut glass, even the marcasite-sized ones.
Judith Miller has produced a book on costume jewellery, just recently. I believe it is somehing that is on the "up", as far as collectability is concerned.
I'm particularly fond of turn of the last century foil beads, my favourites being Venetian fire opal. These are hand made beads, the body is a random mix of amber, opalescent and clear glass, containing crinkled gold foil. I don't know much about them though. There are "Bohemian" foil beads as well.