Which renowned author created the famous advertising slogan "A Diamond is Forever" for De Beers while working at an advertising agency before achieving literary success?

Throughout history, some of the most memorable advertising slogans have been crafted by renowned authors before they achieved literary fame. Many famous writers started their careers in advertising, where they honed their wordsmithing skills before publishing acclaimed novels, poetry, or plays. This trivia question explores the fascinating intersection of literature and advertising, challenging you to identify which celebrated author created a specific iconic slogan that remains recognizable today.

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Frances Gerety (not primarily known as an author, but actually created this slogan in 1948)
F. Scott Fitzgerald (who worked in advertising before publishing 'The Great Gatsby')
Dorothy L. Sayers (mystery novelist who worked at S.H. Benson advertising agency)
Salman Rushdie (who worked at Ogilvy & Mather before his literary career)