I had two diamonds also, none as high as his king. In his hand was two diamonds, one of which was the king of diamonds. My opponent thought he would win the hand, since an Ace of diamond, 3 of diamond, and 5 of diamond were on the board, so my opponent raised all in.
The river card was a 5 of diamond, which gave me a steel wheel.
A steel wheel is a 5 high straight(Ace, 2, 3, 4, 5) all the same suit(a flush).
