Is This a Natural Claw or Tooth – or Is It Manmade?

by Caitlin.
(County Durham)

My Grandad bought me this necklace ages ago.

I don’t feel comfortable not knowing if it’s real or not.

The black stuff on the back is sticky, and inside the tooth/claw (I couldn’t get it to focus, sorry) also has black stuff (maybe mud?) inside.

Can you identify this item?

Thank you.

Caitlin