I think I have owned just about every blush from MAC that would show up on darker skintones. Here are my favs:
Blunt (my very first ones, it's lived for about 5-6 years now)
Gingerly
Rose Quartz
Springsheen
Loverush
BUT, these are the ones everyone else my complexion seems to love that I just couldn't get to work for me:
Ambering Rose
Raizin
Breezy
I think it's cuz they are too cool toned.