The problemis that the main source of ebony grips is from Eagle. Over half of the grips I have purchased from them have been poor fits. One set required fitting I would classify as extensive. Ebony is a resonably dense wood as is used extensively in wood wind musical instruments. However, if it is not exactly fitted it will chip. Even the densest of tropical hardwoods will crack and split if not properly fitted.
Well, I finially bought a pair of Ivory Micarta custom grips from Letts and I love them. Fit and finish are excellent, price + s&h was $97.00. They are straight cut at the bottom which gives room for my pinky.
The toughest grips I ever saw are Tropical Ironwood grips given to me by a Foreign friend. I have a few dozen to only fit Smith and Colt double action revolvers.
They were made in the early 70's and the wood is no longer allowed out of the country unless it is in a work of art. The wood is now a National Treasure.
My friend wanted me to market them but he passed away too soon.
They are over sized to show the beauty of the wood with a laquer finish and it will take a carbide cutter to trim or make finger grooves in them with a Dremel tool they are so tough.
The trees they came from were hundreds of years old.