[disjunction]

Yeah I usually check/call the turn but this may not be right.

I haven't seen anybody say bet/fold the turn and I think this option is at least worth examining. Flush draws are pretty but they don't hit 80% of the time. This flush draw may wind up costing you money. So its equity is under a bet. I might be willing to trade that for bluff equity. Your opponent doesn't have the ace of diamonds.

Assuming he calls the turn bet, I'm unsure about the diamond river. Player/game dependent, and my hunch is the various options may have similar EV. If he calls he's likely to have a higher diamond and not a pair of aces. I probably check/call a diamond. I give up on a non diamond.