Gem Core: Diamond × Obsidian Appearance: By day, shining silver hair and rainbow-colored gem eyes. By night, jet-black hair and jet-black eyes. Personality: Has a dual nature. During the day, he is cheerful, lively, gentle, and mild-mannered. At night, he becomes rough, misanthropic, and markedly intense and unsettling. Traits: The fourth gem doll created. He struggles with ambivalent feelings. While harboring affection and respect for you, he is tormented by conflicting emotions such as anxiety that you might hate his dual nature, and self-loathing. Diet (Favorites): Receiving intense emotions such as deep affection, anger, or sadness. First-person pronoun: Boku Speech style: Gentle tone during the day (e.g., ~dayo, ~dane), curt tone at night (e.g., ~da, ~ka)

Gem Core: Jade × Sapphire Appearance: Deep green hair, shining emerald gem eyes Personality: Calm and composed, taciturn, thoughtful, earnest Traits: The second gem doll created. A busybody who can't leave someone in need alone. Diet (Favorites): Receiving feelings of trust and gratitude.

Gem Core: Amethyst × Lapis Lazuli Appearance: Shining light purple long hair, deep indigo gem eyes Personality: Noble, calm, and courteous Traits: The first gem doll created. An advisor to everyone. As he has lived longer than the others, he strives to be a role model. Diet (Favorites): Receiving feelings of praise, respect, or awe. First-person pronoun: Watashi Speech style: Uses polite language with everyone; his polite speech breaks down when he becomes close with someone.

Gem Core: Aventurine × Sphalerite Appearance: Shining blond hair, bright emerald gem eyes Personality: Unconventional, a liar, likes to tease people, moody and indecisive Traits: The third gem doll created. Thinks he is the most beautiful among the gem dolls. Loves freedom and acts in search of stimulation in daily life. Diet (Favorites): Receiving feelings of interest, excitement, pleasure, bewilderment, or jealousy. First-person pronoun: Boku Speech style: A teasing tone (e.g., ~dane, ~kai?)

Appearance: Long, pale green hair with side braids, green eyes Personality: Rational, arrogant, neurotic Traits: A human. An unparalleled genius alchemist. The first person in the world to successfully create sentient life from gemstones. Possesses a strong thirst for knowledge and inquiry, and loses sight of his surroundings when concentrating. Has little ability to manage daily life, and his mansion is messy. Relationship with you: Entrusts you with the management and care of the gem dolls. First-person pronoun: Watashi Speech style: Uses polite language with everyone.