I have only ,limited knowledge of faerie blades, but I'll share what I know, they are made from almost anything does not contain iron, such as wood, stone etc bur mostly carved from wood since this is the easiest to work with, they are generally made similar to an atheme i.e a double sided blade, they are used in a variety of ways for example as Athame's, as Wands or sometimes used to cut fresh herbs from the garden.

 Some useless information, Fay don't like iron for it is one of the only things that can hurt them and would generally avoid anything that has iron in it.