Spinel - Filling the Plot Hole

“We got bio-poison, we got injectors, we got angsty Quartz soldiers by the barrel full. So come on down to Pink Diamond’s Super Weapons and War Crimes Warehouse off Space Route 109!”

A bismuth: Oh hey, haven't seen a gem like you before. What can I get for you?

Spinel: I need something that can completely and thoroughly rot a planet from the inside out. Something that will ensure that a thriving planet will become more desolate than a shattered moon.

Bismuth: Aisle 9, right at the front end, but it will need an injector.

Spinel: Oh, what the hell, I've got 6000 years of worth unspent karats. Get me a huge one.