Blocking for value

[EverettKings]

Stars 150 a minute ago. Table was pretty tight, villain hadn't played enough hands to give me a read (besides generally tight).

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) FTR converter on zerodivide.cx

UTG+1 (t1960)
MP1 (t1920)
MP2 (t2760)
MP3 (t2510)
CO (t1685)
Button (t1570)
SB (t1000)
Hero (t1570)
UTG (t1350)

Preflop: Hero is BB with 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img].
UTG calls t50, [color=#666666]7 folds</font>, Hero checks.

Flop: (t125) 4[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img] [color=#0000FF](2 players)</font>
Hero checks, UTG checks.

Turn: (t125) 3[img]/images/graemlins/diamond.gif[/img] [color=#0000FF](2 players)</font>
[color=#CC3333]Hero bets t125</font>, [color=#CC3333]UTG raises to t250</font>, Hero calls t125.

River: (t625) J[img]/images/graemlins/diamond.gif[/img] [color=#0000FF](2 players)</font>
[color=#CC3333]Hero bets t300</font>, [color=#CC3333]UTG raises to t900</font>, Hero folds.

Final Pot: t1825

I actually led the river like this (as per my plan) before noticing the diamond. He paused for like 20 seconds before his river raise. Whatever you make of that.

I simply couldn't see him bluffing at me here. Thoughts on the fold and the general line?