A GEM (Generable Enigmatic Matrix) controls an Otome's access to her powers. The name "GEM" is actually a pun, as GEMs are named after actual gemstones and resemble them. They always come in pairs, one is worn on an Otome's left ear and the other is on a ring of the Otome's Master excluding the Columns, Pearls and Corals. This is purely ceremonial however as physical contact is all that is required evidenced by Mikoto who holds her GEM in her belly.
Except for the Five Columns, the GEM requires authorization from the Otome's master before it allows her to materialize her Robe. It is never clear how Meister GEMs are made in the anime; in the manga, in the opening of chapter 2, it is explicitly mentioned that Meister GEMs cannot be made. In either case, GEMs are preserved when an Otome cancels their contract, as is evidenced by the Pure White Diamond, the Sky Blue Sapphire and the Abyssal Green Jadeite. However, the Excel Elegance White Onyx is never shown after Fiar is killed by Midori. Some GEMs are also lost, such as the Neptune Emerald shown in the last episode of Mai-Otome Zwei.
List of GEMs and users Edit
|Lofty Crimson Jade||Blue Sky Sapphire||Bound Dragons Rhodonite||Neptune Emerald||Pure White Diamond||Ultimate Black Diamond|
|Lena Sayers||Lena Sayers||Raquel Mayol||Nina Wáng||Fumi Himeno||Nina Wáng|
|Ayane Hazakura||Arika Yumemiya|
|Galactic Aquamarine||Ice Silver Crystal||Bewitching Smile Amethyst||Break String Spinel||Swirling Dance Fluorite||Eternal Recurrence Jasper|
|Sara Gallagher||Natsuki Kruger||Shizuru Viola||Juliet Nao Zhang||Maya Blythe||Maria Graceburt|
|Elliot Chandler||Iruma Vandeveld||Una Shamrock|
|Stormy Sakura Chrysoberyl||Whirlwind Rose Quartz||Pure Heart Malachite||Spiral Spin Serpentine||Illusionary Lapis Lazuli||Continental Orb Topaz|
|Sakura Hazakura||Kyoko Shimabuki||Akane Soir||Shiho Huit||Yukariko Steinberg||Haruka Armitage|
|Excel Elegance White Onyx||Abyssal Green Jadeite||Infinite Wisdom Azurite||Fire Stirring Ruby||Rainbow Cloud Rhodonite||Mysterious Peridot|
|Fiar Grosse||Rosalie Claudel||Ảnh Lữ||Mai Tokiha||Erstin Ho||Akira Okuzaki|
|Rushing Dragon Lazulite||Black Smoke Chrysoberyl|
|Rila Mariposa||Nina Wáng|