This ammonite is the first piece I ever cast. My search for an ammonite pendant wasn't coming up with what I was looking for. Whilst walking along the Jurassic Coast at Charmouth in Dorset I found this Promicroceras Ammonite. It is a really tactile object that it over 200 million years old! Measuring 1.5cm across, this ammonite comes with a 18 inch chain.