FYI honey...it's just a joke!!
Marry a Russian girl. They don't believe in engagement rings. I tried explaining the concept of an engagement ring to my Ukrainian wife and she didn't have a clue what I was talking about!
Just kidding of course! The jewelry business traditionally advises spending 2 months' salary.
Go here for some interesting info: Engagement Ring Etiquette
FYI honey...it's just a joke!!