The general concensus looks split between the turn and the river. If this is so, then it becomes a CLEAR turn raise.

No one mentioned (or at least I didn't see it) the implications of a missed bet on a semi-bluff. If villain has KT, T9 or some diamond hand, he will 100% pay on the turn, but not on the river.

Assuming everything else is equal, this factor alone should be enough to sway the play to a turn raise.