[gabbahh]

You say flop is Ad Qh 7h with two diamonds. So I am assuming two diamonds.

I guess that the river was another diamond or an Ace.
Very bad in both ways..
Guess he had A(non diamonds)Kd .
You played it ok. The weak raise on the flop by villain suggests he wants to draw cheaply. So your reraise is good. His calling of your raise might suggest a made hand like TPTK. Next his checking on the turn and the calling of the allin made me put him on Ace non diamonds with a random diamonds like a king (he was getting good odds for his turn call). With A?Kd being the most likely.
You got outdrawn. Your opponent played it bad, but got lucky on the river.