Board Thread:General Discussion/@comment-26109604-20150617005735/@comment-508329-20150617063412

She was probably there with Rose and Pearl when they discovered Amethyst.

Maybe the dark secret is that Amethyst isn't the first Kindergarten Gem they tried to save. Maybe the others had to be bubbled after they turned into monsters.

Maybe the dark secret is that Sapphire was one of the gems overseing the Kindergarten before she met Ruby (maybe her job was to use her future vision to try to figure out how to prevent gem corruption).