Euclase is one of the Gems who does patrol duty, secretary work, strategy planning, and other odd jobs. Euclase seems to be partnered with Jade. They are one of the elder gems. __Appearance_Euclase has a white and blue color scheme and wears the winter or summer uniform depending on the season. They also wear standard black shoes but no gloves or socks. Their hair is cut short with blue on one side and white on the other (The colors seems to be able to switch sides). They also have thick eyebrows. __Personality__ Euclase takes their job as a secretary seriously. Despite this, they are kind and caring to all of their siblings, including Phosphophyllite. They were the first to rush into action when Phos was swallowed by a giant slug that invaded the school. It seems like they know their limits and will not do anything unnecessary if it's not the best course of action. They play along with Phos' jokes and have a strong sense of responsibility. They are shown to be quite perceptive, being one of the first to notice Phos' strange behavior after they returned from the Moon. But are also partial to reasoning over violence.
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.
