The Egyptologist, cut out to us a vase: tools and methods of processings of a stone

"The methods used by Egyptians for are sharp firm stones which they so often processed, long time remained uncertain. Various assumptions some of them expressed were very impractical; but any actual proofs of used tools or a way of their application it was not received" "By a typical method of processing of firm stones - such as granite, a diorite, basalt, etc. - there was use of bronze tools; they were supplied with cutting edges, much firmer, than quartz on which processing was made. Material these edges yet...