Shes asking for a diamond ring and u've only been with her for a month? Well if i were u i would explain to her that ur not going to get her one. A diamond ring (in my opinion) is a marriage ring, not a Christmas gift for a girlfriend of one month. I would still get her something but nothing as pricey as a diamond ring.
A diamond ring? That seems kind of... a lot... for just dating her for one month. Maybe explain to her that you can afford that but she is going to get something else awesome. Or however you want to word that. :) I would save the diamond for the marriage. ;)
A diamond ring is too expensive for a couple only dating for a month...Just in case she is "one of those" (not saying that she is), don't get her something that extravagant. Get her an outfit or something
Slap her and run away!!!!! Haha jk Don't do anything You r not comfortable with. Also depends how old y'all are. If u are just teenagers, don't do something stupid by committing to someone you may not be in love with. If u r an adult then it is up to u to decide if u are ready for that sort of commitment. Bottom line don't do something U r not comfortable with. Good luck man.
Why don't you just get her what you would like for her to have for Xmas. If she appreciates your thought and the kindness in putting into getting her a gift, then maybe you might feel a diamond ring is suitable for valentines day! Now if she doesn't appreciate what you get her on your own, then you better open your eyes!
One month is definately too soon for a diamond ring. There are other nice choices such as a necklace, earrings, but nothing as lavish as a diamond ring. You have to know for sure that your relationship is going to last and that you belong together. If she truly cares about you she will understand.