I would imagine that clay blanks would not survive a "drop test". What do you see on their durability? I'm trying to prepare a user's guide on caring for clay blanks to give when I sell one.
My wife has one of Toni's keyrings from about the first day Toni joined here. Her keys have been banging on it and she's dropped it several times over the last six years. It still looks good. It is much tougher than I imagined.
"Polymer clay" is not a ceramic -- it's a plastic. Specifically, PVC. Once baked, polymer clay blanks could theoretically be as durable as blanks cut from PVC water pipe.