By Daily Crux Editor Brian Hunt:
In the late 1930s, advertisers and diamond executives began one of the most successful marketing campaigns in history… the marketing of diamond engagement rings.
In just a few decades, the "A Diamond is Forever" campaign convinced America that a marriage isn't really a marriage unless a De Beers diamond is involved. De Beers launched a similar campaign in Japan that changed centuries of tradition.
De Beers also managed the production and distribution of diamonds to create one of the great cartels in modern history. The article linked below is over 25 years old, but it's a great tale of marketing and global conspiracy.