[hoyasnaxa]

I do not see him having the flush, because the A,K, and Q of diamonds are all out there. Hands that he would call a pot sized raise preflop are small, and I doubt he is calling a pot sized raise with J10d, 109d, or something to that extent, given that you said he was tightish. Checkraising all in seems like a plan to me, if you think he will bet. A diamond on the river doesnt hurt you, unless the board pairs. I cannot see you being behind in this hand on the turn, unless the board pairs, you will win this hand. If your image is aggressive, bet again on the turn and hope he pushes, but checking the turn seems like the better play.