The tens of thousands of dishes carved from stone as hard as quartz and corundum give pause. The ones found in tombs could have been made any time earlier than the tombs they were found in. But anyway I think most are officially pre-dynastic. Certainly the suggested method of manufacture is implausible on its face.

Suggestions that Egyptians melted and molded granite are obviously wrong, because the grain size seen in their products is achievable only with centuries- or millennia-long undisturbed cooling, possible only in nature.