So maybe this has already been pointed out before, but I just learned about this today.
I was watching this video by Weird History on the Mirny (Or Mir for short) Mine in Russia. The mine is a huge diamond mine and when I heard that, I remembered something....
In Steven Universe, the earth looks a bit different than how it does in real life, with one of the significant features being a large chunk taken out of Russia.
I immediately googled a screenshot of the map of Steven’s earth and then searched where the Mirny Mine is located.
Seems like a pretty close match to me. Maybe the Diamonds came from here, or White Diamond took this chunk of earth to make the other Diamonds. The video did mention that a large yellow diamond was mined there...
Or maybe I’m just overthinking things.











