Is it possible that Pink Diamond gave Rose Quartz her sword as a gift?
Hi there! I don’t think that this is likely because of the dialogue we saw in Bismuth.
Bismuth: Rose’s sword. My finest piece of work.
Steven: You made this?
Bismuth: I designed this sword for a fair fight. It can cut through a Gem’s physical form in an instant! Destroying the body, but never the Gem.
Source: SU Wiki
In this scene, Bismuth is quite explicitly saying that she made the sword for Rose herself. Moreover, this wasn’t when they were commissioned under the Diamonds. After the initial exchange between her and Steven, Bismuth goes on to say that joining Rose and deciding to make the sword for her was a direct consequence of Rose’s asking her to subvert the rule of the Diamonds.
She says Rose asked her what she wanted to build. And she adds that no one had ever asked her that before.
This is a very strong indication that the sword itself was crafted after they had decided upon the Rebellion. In fact, since we don’t see her use it in The Answer, it’s believable to assume that it was made even after the initial throes of battle.
Additionally, Bismuth’s making the sword is narratively significant as it speaks of the depth of their relationship, and the relationship that was present between Steven and Bismuth even before they’d met by virtue of his taking up ownership of the sword.
It adds to the betrayal Bismuth felt about Rose. Bismuth’s creation of weapons is always a very personal thing. She tries to find something that fits the warrior for whom she makes the weapons. We see her do this for Amethyst. That she considers, until now, the sword as her finest piece of work shows how deeply she injected herself into the relationship and the physical manifestation of it.