Jack,
Your friend maybe very correct.
However, a napped stone tool does not serve well when pushed into something like leather, unless the tool and/or leather are perfectly aligned with each other. Otherwise, an offset will apply a napping force to the stone tool. Braking off the tip.
I suspect the tool on the left is a type of drill bit. (perhaps used for drilling the eye in a bone needle)
Stone drill bits are not uncommon, but often found with broken tips/points.
Just my thoughts...
My best,
Blair