Where did the Egyptians at the beginning of the Copper Age (at | UnManifest History

Where did the Egyptians at the beginning of the Copper Age (at that time, the last mammoths were still grazing on Wrangel Island in Russia) have the technology to produce complex forms from durable but fragile diorite?

Modern experimenters thought to recreate the vases using primitive ancient Egyptian technology, but the diorite just split apart.

The remaining piece produced a jagged cut, a quality just on the level of ancient man.

These experiments show that the Egyptians clearly did not do so.
There are not many options, either the technology was higher than we are told, or the pieces were made later.