@velimir you probably will like book Propaganda
Book by Edward Bernays or "The Century Of Self" documentary.
It exactly explains how ~100 years ago Edward Bernays (his uncle was Sigmund Freud) created PR industry and with that consumer society.
(a.k.a. - selling useless merchandise to each other every single day)
Very eye opening stuff.
P.S. Diamonds are definitely for ever - 100% :/