Very well done. I think the bone looks like, well bone. To me it is pretty distinctive from oosic or ivory. I've seen a lot of knives from various countries around the Mediterranean Sea with bone handles. To me it says the knife, and therefore the owner, mean business. Class with a sinister air.
I got a couple questions. Did you make the wrought iron yourself, or did you use pre existing stock? Was the guard made in the same manner as Bruce Evans tutorial on guards like that?