These are Ammonites Fossils in small size. These have not been cut in two so you can enjoy seeing the almost untouched outside. There is some light polishing. There is a lovely red opal flashes showing on most if not all the shells.
If you want to wear them consider turning these into pendants with wire wrapping or a hemp necklace. The photo shows the quality of those in stock.
We will intuit which is right for you and ensure that we choose from the ammonite fossils in good condition.