There is 75% pot left, so for me I am jamming here. I dont like to bet something like 50% pot and then leave him a small amount of chips left, so that I am getting 8:1, if he check-jam on me. The only other possible size for me would be a very small one, and with top two we are not going for thin value, so I dont like to pick a very small size.
Sure we could be beat by a straight or a set, that slowplayed the turn, but I think, its way more likely, we have the best hand, and I also think, enough worse hands can call a jam. He can have a worse two pair, and if he was chasing a flush or straight and ended up with top pair instead, a lot of people wont be able to fold. Some might even get sticky and call down with KJ or KT, because they simply dont believe you. And whenever we have a nutted hand, we want to at least give people a chance to make that big failed hero call.
Its also still fairly early in a 45-man SnG, so there is no particular ICM pressure on either player yet. These are not expensive tournaments, and they run all the time, so for most people, if they bust here, they just play another one. This is not a spot, where we expect to see people making tons of nitty folds, but of course that will also depend on the player type.
I understand a jam here if you made one since if you were going to bluff a missed diamond draw you would be putting it in here. Ranging the villain who looks like they called our open, check called flop and check called turn then I am thinking they are on a missed draw themselves (dont know the sizings of those bets) or they are Kx heavy. Of course they could have some hands that beat us but I think a set raises the turn and I think J10 raises the turn as well unless maybe it is specifically J10 diamonds. Given that I believe the largest chunk of their range is Kx which will mostly fold now to the river Ace I would be betting pretty small here (12-15 BBs) trying to get a crying call. If they were to check jam here I would have to tank for a while but probably would lean towards making them show me the J10 because again I dont think a set check calls twice on flop and turn.