What is the #1 rated ad slogan of the twentieth century?

De Beers' "A Diamond Is Forever" is the number one rated ad slogan of the twentieth century, according to Advertising Age (1999). The slogan was conceived in 1948 by the advertising firm N.W. Ayers.

The slogan was so powerful that it is ingrained in our mind until today that diamonds must be associated with love, dating, and marriage. De Beers' promotional campaign was just brilliant and superb. (Note: De Beers is a group of companies that are involved in exploration, mining, trading, and retailing of diamonds).

During the Hollywood's Golden Age, De Beers provided their jewellery to famous movie stars (eg. Marilyn Monroe) to be worn on-screen and off-screen. And the best marketing achievement of De Beers was when the 1953 film "Gentlemen Prefer Blondes" starring Marilyn Monroe was released. In that movie, Marilyn Monroe could be heard singing "Diamonds are a Girl's Best Friend". That phrase is already a cliche today.

Furthermore, "Diamonds are Forever", a James Bond's film which was released in 1971, indirectly strengthened the product positioning of De Beers' jewellery.

Of course, it does not end there. Diamonds are continuously shown in various engagement and wedding scenes in movies throughout the decades, which are actually promotional campaigns initiated by corporates.

De Beers has successfully created the concept that diamonds are essential elements in human relationships, love, dating, and marriage. Clap clap....

Aren't we humans docile and gullible? Clap clap....