Now that the series has ended, many fans were somewhat disappointed with the ending, since some things were left unfinished and some doubts remained, the one that caused the most confusion was the chest that is in the lion's mane, which in the end they never revealed to us. what was inside. There have been many rumors about this, for example some say that what was inside was the jacket that Steven now has and this could make some sense but if we think about it, as much as possible it is not that it turns out to be like that, let's remember that in the events of the movie that is when steven first appeared with the jacket he still felt confused about his mother and it would not make sense for him to use a gift that she left him we can even see it with her during the series when he found out that she was the one that caused the wound to pink pearl and he continued to use it so we could rule out that the jacket has been inside considering that steven would never have used a gift from him, although there is something else that we must consider and that is that in the lion's mane she left other things for steven and these were very important.

the video in which she told him how much she wanted him to be born and that she will enjoy life.

the flag and the sword that were memories of the war,

although there is something else that we must consider and that is that in the lion's mane she left other things for steven and these were very important.

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the video in which he told him how much he wanted him to be born and that he will enjoy life, the flag and the sword that were memories of the war, the shirt and the photograph in which Greg appeared that were memories of how much he enjoyed the time spent with him

and by and finally the Bismuth gem. Each of these things mean a lot to her since they were parts of her life but something striking about this is that she left them all together with the tape which tells us that she wanted steven to see them so we could consider it as a kind of messages left for him

lion was the first message and it meant that rose was hiding some secrets from others

the tape was to let steven know that she really wanted him to be born and not that she had him to solve her problems

the flag and the sword symbolized war and showed him the part of his life in which he had to participate in war in order to defend planet earth

the photograph and the shirt represented the love he had for greg and showed him that he really loved him

and finally the bismuth gem which shows us that she wanted Steven to find out what she had done

This shows us that Rosa, leaving these objects, wanted Steven to be able to know her through these and that he could know her life, her old mistakes so that she would realize that she was not perfect as everyone told her and the moments she had to go through. , with this we can assume that what was inside the chest was also important and symbolized a part of her life that very few knew and that she wanted him to know and, considering that the other objects showed facets of her life when she decided to live as a rose quartz then we would have the only facet that was missing to reveal and this was when he was in the home world living as a pink diamond possibly what has been inside the chest has been something that reveals part of his past life for example the fragments he created for fake his death or perhaps some object that he brought from the Homeworld. Possibly what was in there were not important things for the plot but perhaps they had a meaning in which they would allow Steven to know all the facets of his mother's life and it would make sense that it is open after the series already Which is when Steven finally knows his mother was Pink Diamond

And for now this is all the information that can be drawn and considering that the series ended as much as possible it is that we never know what exactly was in this chest but we must remember that they left many details in the series so that we can draw our own conclusions so that we just have to analyze a little