Amethyst are two twin Gems who mainly do patrol duty. They are individually named Eighty-Four and Thirty-Three. They're two in one and partnered with each other. According to Yellow Diamond, twin Gems will not break when they touch each other, as demonstrated when the twins bash their heads together, much to the chagrin of their observers. They are both great at swordplay and were recommended to train Phos for a short time.
Land of the Lustrous
In the mysterious future, crystalline organisms called Gems inhabit a world that has been destroyed by six meteors. Each Gem is assigned a role in order to fight against the Lunarians, a species who attacks them in order to shatter their bodies and use them as decorations. Phosphophyllite, also known as Phos, is a young and fragile Gem who dreams of helping their friends in the war effort. Instead, they are told to compile an encyclopedia because of their delicate condition. After begrudgingly embarking on this task, Phos meets Cinnabar, an intelligent gem who has been relegated to patrolling the isolated island at night because of the corrosive poison their body creates. After seeing how unhappy Cinnabar is, Phos decides to find a role that both of the rejected Gems can enjoy. Houseki no Kuni follows Phos' efforts to be useful and protect their fellow Gems.
