When I flop a flush and the board doesn't pair.. at 10NL I don't really care about the warning signs. He will do this with 2p/set often enough to make it +EV.. or a "test raise", although that doesn't seem too likely. I think he has a hand here, which is more often than not one that I beat. At 10NL I find I make the most profit if I just ignore whatever idiot things they're trying to pull (unless I have them pegged as a total nit) and just get it all in there whenever there are very few or only improbable hands that beat me.

This could very well be QJ (or 44) who thinks you have Ad or something and gains confidence on the turn when it's not another diamond. I've seen that sorta stuff often enough..