Neverita

The colony was difficult to colonize in the first place as is, taking several hundred years to even begin any progress on it. It was the "problem colony." A lot of things kept going wrong with its construction, a lot of shortcomings. It's also quite extremely remote. There'd just be a lot of struggle for Yellow Diamond to conquer the planet. She was slowly making progress, having it be a sort of side thing as it wasn't even worth that much seeing as it was a smallish planet with not much nutrient rich minerals. Eventually though, Pink Diamond was shattered and Yellow, in her grief, just abandoned the colony entirely with having let it fall by the wayside and just slowly and steadily became forgotten about and became less popular. She let the colony fall is disrepair and didn't bother to continue with it. A lot of gems didn’t really like anything the planet had to offer and as it was already such a mess.