I've made a couple sets of Ivory grips. A member here years ago sent me a Hippo tooth. He figured I could get 3 sets out of it. One for him, one for myself and one to donate etc. He was correct but I misunderstood and tried to keep the outer skin of the tooth. He wanted pure ivory so he could get it scrimshawed. Anyhow the outer skin was tough, hardest grips I ever made. Cutting on a bandsaw it threw sparks. Hard stuff. Once the outer layer was filed off it wasn't bad, not easy but much better.
The thing about ivory and fortunately I'm glad I researched. You can't get it hot. If it gets too hot to touch, eventually it will crack. So you have to work kind of slow. Can't just whip out the bench grinder and grind away.
He sent me a picture of the set I made, I'll try to find it. He was an military officer and he had the names of his men that he lost scrimshawed on the grips. Turned out very nice. He also sent me a very expensive knife that I still have. Didn't realize at the time how costly it was. He won it in some shoot contest as I recall.
Here's a shot of the hippo tooth as it arrived.
And my set which I managed to save after the miscommunication.
I'm told most people don't shoot their guns with ivory as they can be delicate. I don't know for sure. Mine seem plenty solid and dense. I think they would be ok. Revolver grips being thicker I assume would be ok too but got nothing to back that up with.
I didn't make this set obviously, they came on it but I kind of like em.