How a Late-Night Tagline Turned Diamonds Into Forever
TL;DR
Frances Gerety, a 31-year-old copywriter at N.W. Ayer, reportedly penned De Beers’ tagline 'A Diamond Is Forever' in 1947, a four-word line that helped normalize diamonds as the symbol of eternal love and reshaped engagement norms across roughly 40 countries. The slogan ran from 1948 onward, reinforcing a marketing-driven idea of value (including the famous two-month-salary rule) and turning the diamond market into a multibillion-dollar industry, even as Gerety herself never married. The piece explores cognitive dissonance between the private life of a creator and the public impact of her work, and notes the line’s enduring presence in De Beers campaigns today.
- The line 'A diamond is forever' was written in 1947 by a copywriter named Frances Gerety, who worked late one night, scribbled it down — and never married in her entire life Silicon Canals
- Frances Gerety, the copywriter who coined 'A diamond is forever' in 1947, wrote the line judged the greatest slogan of the 20th century — yet she herself never married Space Daily
- The idea that a man should spend two months' salary on an engagement ring was invented by De Beers marketing — in Japan the campaign set the figure at three, rewriting wedding customs where diamond engagement rings had barely existed Space Daily
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