[West]

If calling on the flop, I think a diamond on the turn is what you don't want to see (since he may be semi bluffing with flush draw, or a pair and a flush draw, and if not, should have you outkicked), and rather than making a move at the pot, this would be the time to get out unless opponent gives you a free card/checks it down. A non diamond would be your cue to go with it on the turn if you are calling on the flop.