Found this knife today at a sale and picked it up, handle looks unique and I think it may be bone/ivory, maybe, but i dont really know how to tell. Half of surface seems fairly smooth, with a blue-ish, green-ish, purple-ish tint to it, almost like a mother of pearl shine to it, while the other half looks fairly rigid, almost like the grains are going a different way, so it made a weird pattern towards the one end. Anyway, here are some pictures, its hard to see the shine to the handle in them, but let me know what you think...
side one
side 2
closeups