IF (and only IF) the diamond is as desirable to her as the CF frame is to you AND you can afford it, sure get her a diamond.
Then start saving some $$ for your bday and the CF frame.
__________________
"...in Las Vegas where -the electric bills are staggering -the decor hog wild -and the entertainment saccharine -what a golden age -what a time of right and reason -the consumer's king -and unhappiness is treason..."