I just finished watching the "Story for Steven" episode, which is basically a SU version of a HIMYM episode, where Greg meets Rose Quartz and the Crystal gems when they were a bit younger, and Greg eventually fired Marty, his greedy manager, giving up his musical career to be with Rose Quartz.
Rose's Scabbard is clearly intertwined with Lion 2: The Movie, where Lion takes Steven and Connie on a detour to Rose's armory.
Pearl seemed to take quite a bit of pride in being Rose's main confidante, until Steven re-visits the room to which Lion brought him; afterwards, Pearl feels some bitter disappointment, as she believed herself to be the sole keeper of Rose's secrets, especially in Rose's armory when Steven uses his own unique style to make the weapons appear and pulls Rose's sword from Lion's magic storage space; after some reminiscing about Rose and reconciliation with Steven, all is well again....