Frances Gerety

Frances Gerety (1916–1999) was an American advertising copywriter at N.W. Ayer & Son, the Philadelphia agency long associated with De Beers’ diamond marketing. She is widely credited with coining the slogan “A Diamond Is Forever” in 1947, a line that became central to De Beers’ U.S. advertising and to the modern association of diamonds with engagement and enduring commitment. Working within Ayer’s creative staff, Gerety helped shape mid‑century print campaigns that emphasized permanence and emotional value over price. Her authorship of the phrase has been repeatedly cited in accounts of advertising history and De Beers’ campaigns.