Hello! I'm very new to fossils and this is my first time posting here. So if I made any mistake please forgive me. I want to buy an ammonite but I've never had one before so I know nothing about them, so it's best if I ask the experts before I reach into my pocket. These things inspire so much curiosity and wonder in me, and the fact that I can actually have a real fossil that's millions of years old amazes me! So are these real? If so, how do you know?