In the 1930s, what innovative marketing campaign did jewelry retailers create to dramatically increase diamond sales during the Great Depression?

Throughout history, some marketing campaigns have been so innovative they've become cultural touchstones themselves. In the early 20th century, as mass production and national brands emerged, companies pioneered techniques that we still use today. This poll tests your knowledge about one of the most ingenious product marketing campaigns in retail history - a strategy that transformed a struggling product into a cultural institution and created traditions that persist decades later.

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The 'A Diamond is Forever' slogan and the tradition of diamond engagement rings
The introduction of diamond 'birthstones' for each month of the year
Celebrity endorsement program featuring Hollywood stars wearing diamonds
The 'Diamond Club' loyalty program offering lifetime maintenance and upgrades