Just finished filling my 25 each Bras and Masks Achievements.
Some people think you have to do 200 or more profiles to get 1 rare bling. But it is totally random, I get 1 rare in 500 or more profiles.
Then other times I get 3 rare bling in less than 500 profiles, happen to me twice, with in 15min.
Usually while racing thru noob profiles this happens.
Happy Hunting Fellow Fu's