since its made of millions of gem shards, it could very easily have been any sort of homeworld prisoner, like how in attack on titan, eldian prisoners become titans instead of serving jail time. i don't think its the entirety of pink diamond's court, since eyeball swears she was there, and is still kicking.

there is the theory that the cluster was made in an attempt to see if they could bring back pink diamond, ie bury her gem shards and wait, which could be a reason why yellow wanted it so badly beyond petty revenge, making homeworld think the earth didnt exist like in the records, etc.

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