It wasn’t necessary to have iron tools or diamond saws.
http://www.freerepublic.com/focus/news/3798099/posts?page=145#145
http://www.freerepublic.com/focus/news/3798099/posts?page=137#137
interesting. i was not aware of this. however, it remains to be demonstrated that these individual techniques can be applied to create an actual obelisk with bas relief, actual petri core, or actual sacarphagus demonstrating the accuracy and details achieved by the ancient egyptians, unless someone am not aware of in modern times has actually done it...