it’s not just because rose killed pink diamond, look at how she looks when she says “my diamond”

It’s not that different from how pearl looked when mourning rose

So, jasper probably felt the same way about pink diamond that pearl did about rose and rose took it away from her.

But here’s the funny thing, rose was very against killing to the point where she bubbled her best soldier to prevent it from happening. That’s another reason I think she’s pink diamond. She probably killed pink diamond in the same way darth vader killed anikin skywalker.

Now think about this, jasper is a perfect quartz. A perfect quartz from beta kindergarten. She is the epitome of what a quartz should be, strong and for homeworld. So imagine how she would react when her diamond starts taking in rejects and defects to go against homeworld. it would feel like betrayal to her. So she not only resents rose for “killing” pink diamond, but for choosing the lesser gems over her.