[pokerjunky]

I was going to say bet and hope BB raises to try and fold some low diamonds but the only person that would possibly fold a low diamond is the original PF raiser. The loose passive CO isn't folding one, the tight TAG button probably doesn't have a diamond low enough that he would cold call a raise PF, and the goofy BB surely isn't folding for one bet on the flop. Since hand protection is unlikely now, checking the flop is probably best, and if its only one bet when it gets back to you, check raise. Otherwise, wait for a non-diamond turn then bet out.