>>150078152
>Then, when that got everyone she knew killed and the earth targeted for destruction, she passed the buck of solving the problem onto her son by giving him her powers and ceasing to exist.
IIRC Rose didn't know about the cluster and she decided to have Steven after 5000 years. Which arguably isn't a lot to a gem, but after what happened it was enough to make her think that the Diamonds were never going to come back to Earth. And it's worth remembering that Rose was at least partially motivated by her thinking that the other Diamonds didn't care about her.