So when starting to work with beads I became very interested in (again) all these neat semi-precious, precious, rocks, what-have-you and trying to see what I could play with next on my limited budget. The most recent fun thing is cat's eye or chrysoberyl. Very cheap ones. Here is the link to see one and a picture of a really expensive kind. The link also is the gem guide that is my new best friend. Mostly expensive things but it takes the place of the book I lost.
These are fascinating. Here is a necklace/choker and earrings I made with royal blue ones.
Here is another great website with more information than pictures and some great info about Chrysoberyls like this :