Which historical marketing campaign first transformed the perception of diamonds from occasional luxury items to essential symbols of engagement and love?

Marketing campaigns have shaped consumer behavior throughout history, often reflecting the social and economic climate of their times. Some campaigns were so revolutionary that they fundamentally changed how companies approached their customers. Test your knowledge about one of the most iconic retail marketing shifts that transformed an entire industry and consumer perception.

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De Beers' "A Diamond is Forever" campaign (1947)
Tiffany & Co.'s "Blue Box" campaign (1906)
Cartier's "The Jeweler of Kings" campaign (1924)
Harry Winston's "Talk to Me Harry Winston" campaign (1952)