Which 1980s advertising slogan led to the most dramatic shift in the jewelry industry's traditional marketing approach, causing consumers to expect diamond engagement rings to cost approximately two months' salary?

Throughout history, certain advertising slogans have been so powerful they've permanently altered consumer behavior and shaped entire industries. These marketing masterpieces transcended simple promotion to become cultural touchstones. Test your knowledge about the historical impact of iconic advertising slogans that transformed how consumers interacted with brands and products.

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De Beers: "A Diamond is Forever" (1948)
De Beers: "Two Months' Salary Showed the Future Mrs. Smith What the Future Would Be Like" (1980s)
Tiffany & Co.: "The Right Hand Ring" (1970s)
Zales: "The Diamond Store" (1982)