I just picked up a piece, that needs to be stabilized and don't really like it. It crumbles, pretty sure I paid way to much for the material. This is my first piece and haven't cut any yet. I really wouldn't have a clue what good turquois looks like.
To see some of the best, go to https://www.facebook.com/groups/214328235440475/
Where they post pics of the top 5% of the best turquoise in the world.