Ammonites were cephalopods like octopods or nautiluses (nautili? I don't know), but they're long extinct now. I've said before that I'm a little leery of buying fossils just to wear when they should probably be studied instead, but ammonites are really very common so I made an exception.
Thinking about some of the other rocks that I wear -- which you'll be seeing soon, if I don't get off my butt right away to take some new photos -- I guess I make that exception more than I want to admit. It's often not done on purpose, though. Proper or not, I sometimes buy things because they look neat and then find out what they actually are later. Um, surprise...
Anyway, this little ammonite isn't worth much in the scheme of things, but some of its relatives are. In southern Alberta there's a deposit of ammonite fossils that, for whatever reason, are iridescent. Literally all the colours of the rainbow. When they're made into jewellery they're marketed as ammolite rather than ammonite, and ammolite doesn't come cheap. It's interesting, though. I might look into a piece someday when I'm feeling flush (ha...)
Notice how I haven't given you links to any of this stuff? Just not in the mood to be that helpful today. Either that or lazy. You all know how to use search engines anyway.
Have you used one to search stoma yet? I don't want you all to be bare beginners when I start talking about that, after all.
Done sitting here now.
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