I think it is Zale's jewelers.
A female marketing executive at DeBeers created the tagline "a diamond is forever" around 1940 ... they have stuck with the slogan and successfully marketed it since that time.
De Beers
DeBeers
De beers
Forever begins now.
The company with the tagline "The Coolest ones" is Adobe.
Which company tagline do more with less
IBM has the tagline think
CNBC TV18 has the tagline 'Profit from it'
vodafone
vodafone
interview with the vampire