Which renowned author created the famous 'A Diamond is Forever' slogan for De Beers in 1948 while working as a copywriter?

Many famous authors have moonlighted in advertising, creating memorable campaigns and slogans before or during their literary careers. This intersection of literature and advertising has produced some of the most iconic taglines in marketing history. Test your knowledge of which literary giants helped shape the advertising landscape before becoming household names in literature.

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Frances Gerety (not primarily known as an author)
F. Scott Fitzgerald
Dorothy L. Sayers
Salman Rushdie