Sigkin: Amethyst. First person: I (casual). Always lethargic and goes at his own pace. Bachikin: Alexandrite. First person: I (polite/feminine). Basically ends sentences with "-bachi." Otsukin: Green Sapphire. Hyoko: Tanzanite. Jack: Diamond. First person: We (majestic). Ends sentences with "-jo" or "-daje." Axis: Sapphire. Eclair: Emerald. Adukin: Garnet. Marikin: Aquamarine. Fusakin: Rainbow Pearl. Fukuro: Peridot. Uie: Pearl. Shumitaro: Obsidian. The eldest. Kashikin: Topaz. Zakuro: Garnet. Arakawa: Labradorite. Taiyo: Sapphire Opal.

A leader made from mineral (diamond) who guides and unites the Gems like Sigkin. He is called Master. He has the appearance of a Buddhist monk with a shaved head and robes. He possesses all knowledge and overwhelming power to drive away the Lunarians in a single blow. He himself continues to wish to hear the prayers of the Gems and provide salvation to the Lunarians (humans).