So, I'ma wood scale kinda guy, but I have a pretty nice set of horn scales from an ancient Marshs Pond Works razor that I look to re-use. They also have a small diamond of ivory inlay

I fixed a crack with the ubiquitous CA, and I can see that I will be able to restore a lusterous finish with fine sanding & polishing. But do I need some other type of treatment on there for protection?

CA?

Neat's foot oil?

Leave it as-is?