When you care enough to give the very best. A firearm says 'your life matters to me' much better than a diamond.
And make darn sure you are mature and stable enough in the relationship before you buy her a weapon.
But as in buying diamonds or emeralds, be prepared to pay.
Ex#3 wanted a $600 SiG for her carry weapon. I wound up with a Bersa. Shows the relative values of our lives, I suppose.
/johnny
Saw this nice S&W M&P 15-22 at the gun show today.