Very impressive.
But if I can ask a stupid question...What is the point? Not for you but for the paleo people that made the originals? A would assume a point like that takes longer to make. And the 'ears' look like they could be knocked of real easily. If your next meal depends on getting a sharp rock into somethings breadbasket, why go to that trouble?
I think they are very nice looking, I just do not understand why someone would develop that.