The whole blood diamond thing aside, the history of diamond sales is really a history of diamond marketing. Since about 1880, the whole industry has been based on creating a market/perceived need where there was none before. The "three months' salary" thing was created by diamond marketers. The diamond engagement ring was created by marketers. Diamond anniversary bands, same thing. The US and European markets got stagnant, so the marketers started a whole campaign in Japan - to create a market where there was none before.
There is a very interesting book, The Heartless Stone by Tom Zoellner
http://www.theheartlessstone.com/
It's a journalism exercise, an exploration of diamond history, culture and lore that is very, very interesting.




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