Here is an amazingly informative article all about gastropods. http://www.kgs.ku.edu/Extension/fossils/gastropod.html
So when I first bought this fossil it wasn't drilled. It took me awhile to figure out how I was going to drill it (I'm not much for wire wrapping). Well, I finally figured it out and so I was able to make this pendant necklace.
I kept it simple with 14k gold filled chain and components, a faceted round ruby, and an asymmetrically placed ruby on the chain. I hope you like it!