Originally Posted by DrivingDog

What could button have?

FD 3bets the flop, so I'm not worried about a made flush here - at least not from him. I think AK/AQ also 3bet the flop as does a set - waiting for the turn and the third diamond to raise is a bit nonsensical.

Once you c/r the field on the flop, he might put you on the FD or on a decent Ace - A8+. A hand like AA, JJ, 99 caps pre, so he can rule out a set. So I think he probably has two pair here most likely with a diamond - A9, A7, J9 - and figures he's either ahead and/or wants to shut out limpy because his diamond is low.

Since you're ahead of everything but AJ (which you're chopping with), I say 3bet. If you think he'd also play this way with AK/AQ (though I don't know why he would - unless he thinks you're capable of c/ring the flop with Jx), then all the more reason to 3bet.

If he's raising a lone diamond or QT w/diamond etc., he's a bit goofy imo. You're obviously not folding anything you'd c/r the flop with, there's no reason to shut out BB if he's drawing, and he's risking paying 3bets to draw when he could easily draw for one.

Just out of curiosity, what kind of image do you have? It seems you're usually assuming your opponents are treating your raises as potentially light.