My gf was born in December and has blue topaz as her birth stone. She really likes it so I was looking for a nice pendant/necklace for her and discovered blue diamonds.
Color wise they are a dead ringer but brighter. Little pendant cost me $265, but she'll love it. This is our second valentines day together so I wanted to do a little more, I'm also talking her to "Cavalia" which is like cirque de soleil with a bunch of horses and shit. She loves horses and dropped the hint in December so I figure its a safe bet. That's another $180, got a box of lindt truffles (her favorite) and taking her out to a nice dinner at her favorite local steakhouse. Dozen pink roses.
I didn't do so great on Christmas so I guess I'm compensating a little, but she's a good woman putting up with me,