I am very appreciative of the advice - I am learning.

Sorry about the stupid question, - I had to ask though

So my biggest mistake is that when he checked that turn, I should have bet 1/2 the pot. Then if he calls, I am thinking he probably would have checked the river and I could have just checked that to see if he had the darn diamond.(?) So NO bet on the river if he calls the turn bet, because he may be clinging to any diamond, right?