This is a list of all the GEMs in Mai-Otome transliterated and translated (albeit somewhat poorly) by yours truly. I am hardcore!

Name
GEM romaji
Translation
[nationality and/or other notes]

Arika
蒼天の青玉 souten no seigyoku
Sapphire of Azure Sky
[Windbloom, but born in Galleria]

Nina
漆黒の金剛石 shikkoku no kongouseki
Diamond of Pitch Black
[Altai]

Mai
炎綬の紅玉 enju no kougyoku
Ruby of Flaming Ribbon
[Zipang]

Sala
銀河の藍玉 ginga no rangyoku
Aquamarine of Galaxy
[First Pillar]

Natsuki
氷雪の銀水晶 hyousetsu no ginzuishou
Silver Crystal of Ice
[Second Pillar]

Shizuru
嬌嫣の紫水晶 kyouen no murasakisuishou
Amethyst of Graceful Beauty
[Third Pillar; born in Windbloom]

Juliet (Nao)
破弦の尖晶石 hagen no senshouseki
Spinel of Broken Chord
[Fourth Pillar; born in Altai]

Maaya
怜踊の蛍石 reiyou no hotaruishi
Flourite of Spirited Dancing (?)
[Fifth Pillar]

Maria
久遠の碧玉 kyuuen no hekigyoku
Jasper of Eternity
[born in Old Lutecia]

Yukariko
幻惑の瑠璃 genwaku no ruri
Lapis Lazuli of Glamour
[born in Florence]

Tomoe / Chie
呪詛の黒曜石 juzo no kokuyouseki
Obsidian of Malediction
[Valkyrie]

Shiho
螺旋の蛇紋石 rasen no jamonseki
Serpentine of Helix
[Cardea; makimaki]

Fia
塊麗の縞瑪瑙 kenrei no shimamenou
Onyx of Potent Beauty
[Cardea]

Haruka
珠洲の黄玉 suzu no kougyoku
Topaz of Jewelled Island (?)
[Aries]

Ein
慧命の藍銅鉱 emyou no randoukou
Lazurite of Wisdom
[Annam]

Karla
雷鳴の柘榴石 raimei no zakuroishi
Garnet of Thunder
[Lutecia; her master is the queen]

Laura
絢爛の頑火輝石 kenran no gankakiseki
Enstatite of Brilliance
[Lutecia; her master is the king]

Rosalie
清恋の孔雀石(~13話) seiren no kujakuseki (ep 1-13)
Malachite of Pure Love
深淵の翡翠(24話~) shin’en no hisui (ep 24+)
Jade of Abyss
[Florence; she was supposed to retire and get married]

Akane
清恋の孔雀石(13話) seiren no kujakuseki (ep 13)
Malachite of Pure Love
[eloped and ruined Rosalie's marriage]

Monica
流水の透輝石 ryuusui no toukiseki
Diopside of Flowing Water
[Cardea; not important]

Rena
蒼天の青玉 souten no seigyoku
Sapphire of Azure Sky
[bored in Galleria; shinso of the Valkyries]

Fumi
真白なる金剛石 mashiro naru kongouseki
Diamond of Pure White
[shinso of the Five Pillars]

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