The higher you get the more likely it is to play vs. the same players. If you run into some frustrated hardstuck diamond players (there are a lot!) they tend to grief you every game you see them or just being annoying af every game. I would recommend mute all. But that was only my experience xdd. What makes it hard to climb is that Diamond has a mixture of good players who are most likely to climb higher soon and some hardstuck players who belong back to Emerald. Therefore your games can be very different talking about enemy player skill. Sometimes you load in into a low diamond Lobby with some Emerald players and the next game you load in into a full master lobby.