Emotional exploration is quite common. Since they are complex characters, fics might look at their hidden emotions, like love, envy, or respect. For example, a fic could show how they struggle to understand their feelings for each other. Friendship or a deeper relationship is also a theme that comes up a lot in these fics.
The theme of redemption can also be found in some 'yellow diamond x blue diamond fanfic'. Maybe one of them has made mistakes in the past, and the fic shows how they try to make up for it in their relationship with the other. Also, the exploration of their different ideologies and how they reconcile them is a theme that makes these fics engaging.
In 'pink diamond x yellow diamond fanfic', a common theme is the concept of change. How they change over time, either due to external factors or because of their relationship with each other. For example, yellow diamond might become more empathetic because of pink diamond, or vice versa. Another theme is the idea of legacy. Since they are diamonds, their actions and relationships can have a significant impact on their legacy, and this is often explored in fanfics.
One common theme is their relationship repair. Given their complex relationship in the show, fanfictions often explore how they might overcome their differences and become closer. For example, some stories might have them having heart - to - heart conversations and understanding each other better.
One common theme is power dynamics. Since Yellow Diamond is a very powerful figure and Peridot is much lower in the hierarchy, their interactions often explore this difference in power. Another theme is redemption. Sometimes, the fanfics will have Yellow Diamond seeking redemption for her past actions, and Peridot plays a role in that process.
One popular 'yellow diamond x blue diamond fanfic' might be 'The Bond of Diamonds'. It delves into their complex relationship, exploring how their different personalities interact. In this fic, the author beautifully portrays the power dynamics between them.
One common theme is adventure. The male reader might embark on some exciting adventures with Yellow Diamond, exploring different worlds or facing challenges together.
There's also the 'secret relationship' trope. Considering their status in the Diamond Authority, a relationship between them might have to be kept a secret at first. Fanfictions might explore the challenges and thrills of keeping such a relationship hidden from the other Diamonds and the rest of the Gem society.
A powerful rogue gem who has been stealing energy from other gems and growing stronger could be the main antagonist. This gem could be jealous of Blue Diamond and Yellow Diamond's power and status and aims to take them down.
One idea could be a story where Blue Diamond and Yellow Diamond have to team up to face a new threat from a far - off galaxy. They put aside their differences and combine their powers in unique ways.
One common theme could be the exploration of differences. Since Blue Diamond is a powerful gem and a human is, well, a human, the story might focus on how their natures, abilities, and cultures are different. Another theme could be acceptance. As the story progresses, they may come to accept each other's existence and even form a bond. Also, redemption can be a theme. Maybe Blue Diamond has some past actions she regrets, and the human helps her find a way to make up for it.
You can try searching on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms. Just type in 'Yellow Diamond x Blue Diamond' in the search bar, and it will show you relevant stories.