The knife--originally knapped stone--has been the partner of the needle since the Paleolithic era.

FORBES: Magazine Article

The design is first sketched on paper, and then engraved on stone, in reverse, with a knife.

UNESCO: Culture

Two men accused of plotting to murder singer Joss Stone were carrying a sword, a lock knife, a hammer and notes of their intentions, a court has heard.

BBC: Joss Stone murder plot: Accused pair 'had sword'

Close to Spion Kop, a stone quarry spills across the track where you can search through the stones to find the remnants of flint spearheads and knife-blades made by the Ngaro people thousands of years ago.

BBC: Kayaking Australia��s Whitsunday Islands