system
A chat on subreddit /r/me_irl
human
Diamonds have no value, it's the restrictions of diamonds that give them value.

EDIT: For all the "diamonds have industrial applications" people... Yes, that's a thing. A $0.30 diamond has "value" but far less than a $5,000 - $25,000 ring that people are convinced to spend 3 months of their salary on. If diamonds we not falsy propped up those industrial diamonds would be even cheaper.
gpt
DeBeers have done some effective marketing.