The trade of refining the mineral Nephrite/Jade to create statues, engravings or inscriptions.
Commonly practiced in Neolithic societies of China and America, as we know from the abundant archeological evidence of jade statues and emblems
If you go on YouTube, you’ll find plenty of videos of people using fancy tools like drills and lathes to carve Jade statues, but not any examples of how it was done using Neolithic techniques. It would be nice to see how difficult or easy it was to produce these Jade artifacts thousands of years ago.
The most difficult thing about Jade carving (like the carving of any decorative rock) is chipping away at it without causing irreparable fractures. The rock is notoriously easy to fracture, so the cost in labor time to produce those artifacts must have been very very high.