Question- Are ivory stocks as fragile as Mother-of-Pearl stocks?
I can't answer all of your questions but I can answer this one; no, ivory is not fragile. It is very tough and durable. It is also fairly easy to work with if you want to shape or size grips. You will find tons of advice on the care of ivory grips, and I will not offer any. But Jim Alaimo, founder of Nutmeg Sports, once told me to wipe down my ivory grips with gun oil once or twice a year to help preserve them.