"What-what is this?" White Diamond glared down at the earthly flecks of...something embedded in her fellow Diamond's hair. Pink Diamond just grinned.
"It's called hay, isn't it wonderful White?" She clambered over a big square, seemingly made out of the...material. "It feels so strange, and the organics make so much of it! I don't know why!" She laughed, her body shuddering with the deep, lovely sound. The sunlight, yellow as the...hay on this planet, caught the edges of her gem just right. It glinted in White's eyes. She squinted. White Diamond didn't understand. Why would Pink be fine with not understanding? She didn't understand what this hay was, she didn't understand why Pink had to have her colony here, she didn't understand why Pink had to be shattered here. The memory shriveled away to dust.
The pink palanquin stood before White Diamond instead. Her resting place, her first colony, her tomb. White nodded once, her face going blank yet again. Her last time off-planet. She walked back into the ship, its majestic visage a copy of her own. "Set a course for Homeworld." As she settled into a seat, White Diamond cleared away her emotions. She knew it had been a long time coming. After Pink's shattering, Homeworld was falling apart. There was only one thing left to save it now.
Her ship landed as it always did, her fellow Diamonds never there. No gems to see her actions. Good. On the edge of Homeworld, White Diamond walked for the last time. She settled against the wall, spread her arms apart, and smiled. A glorious visage for her gems, a radiant smile for her fellow Diamonds, forevermore.
Deep inside the planet's crust, tendrils of white light surrounded the core. Homeworld wasn't going to fall apart. Not when she was Homeworld.