"Perfected through Time"
The other diamond slogan used even more than "diamonds are forever" is "diamonds are a girl's best friend" - so don't use that one either.
"Diamonds are forever...until you expose them to intense UV-C band pulses."
Bit of a new spin on an old classic.
well, how about
Number one on the hardness scale
or
Number one of the emotional scale
the most beautiful carbon on earth
And we thought the project was hard
I have a science project and i need a slogan . . Anything but "diamonds are forever"