Party Poker No-Limit Hold'em, $ BB (10 handed)

Button ($24.05)
Hero ($47.35)
BB ($54.25)
UTG ($16.09)
UTG+1 ($17.93)
Villain ($25)
MP1 ($9.65)
MP2 ($53.37)
MP3 ($23.75)
CO ($11.8)

Preflop: Hero is SB with , . Hero posts a blind of $0.1.
UTG+1 calls $0.25, Villain calls $0.25, CO calls $0.25, Hero (poster) completes, BB checks.

Flop: ($1.25) , , (5 players)
Hero checks, BB checks, UTG+1 bets $0.75, Villain calls $0.75, CO folds, Hero calls $0.75, BB folds.

Should I have slowplayed here? I only did so with the intention of raising big if the turn was not a diamond.

Turn: ($3.50) (3 players)
Hero checks, UTG+1 bets $3, Villain raises to $6, Hero calls $46.35 (All-In), UTG+1 folds, Villain calls $18 (All-In).

River: ($76.85) (2 players, 2 all-in)

Final Pot: $76.85

Results in white:
Villain shows 7d 5d a flush, jack high.
Hero shows Qd 9h a straight, eight to queen.
Hero wins $22.35 from side pot #1 with a straight, eight to queen.
Villain wins $51.8 from the main pot with a flush, jack high.

Just a bad beat...played it fine. You got it all in with the best hand and a good percentage. Can't ask for more then that.