ルビーの胸当て [ruby no muneate] or 'ruby chestplate' in Japanese.
Final Fantasy II
Stats: DEF +15, EVA -5%, MDEF +5%
Equip: all
Obtain:
Other: A breastplate studded with rubies
Other: as 'Ruby Cuirass'
Revenant Wings
Stats: DEF 36, MDEF 24, resist Fire
Equip: Vaan
Buy: 3,200 gil (sell: ? gil), chapter 4
Description: Vermilion armor enchanted to resist fire
Record Keeper

Ruby Cuirass (II)
Stats: DEF +71, MDEF +69, EVA 100 (lv1), ? (lv5), ? (lv10), ? (lv15), ? (lv20), ? (lv25), DEF +116, MDEF +115, EVA 100 (lv30)
Max Level: lv20 (initial), lv25 (first evolve), lv30 (second evolve)
Type: Light Armor, Rarity: ★★★★★
Other: enables use of the Blaster Soul Break when equipped
Category: Equipment