I couldn't miss the chance to practice my drawing!
The Ruby Ring (ルビーのゆびわ or ルビーの指輪, Rubī no Yubiwa?) is a recurring armor or accessory in the Final Fantasy series. Its purpose has varied from protecting against status effects, to boosting stats, to buffing the equipped character.
The Ruby Ring provides 3 Magic Defense, no change in Evasion (though the 3D-exclusive version grants 10 Evasion), 2 Magic Evasion, and resistance against the Pig status. It is initially equipped on Edward. It can be bought for 1,000 gil in Troia, found in Mist, and Troia Castle, or dropped by Lamia and Lamia Matriarch.
The Ruby Ring provides 3 Magic Defense, 2 Magic Evasion, and resists the Pig status. It is initially equipped by Rydia, and additional Ruby Rings can be bought for 1,000 gil in Damcyan and Fabul. The hidden Developer's Office also holds a Ruby Ring.
Ruby Ring protects against Pig. It provides 3 Magic Defense, 2 Magic Evasion%, and no change to Defense and Evasion%. It can be bought in Mythril, Agart, Troia, Lodestone Cavern (Palom's Tale) and Mysidia for 1,000 gil, dropped by Lamia and Lamia Matriarch, and found in Mythril (Ceodore's Tale), the Castle Waterway (Palom's Tale), and Palom's Challenge Dungeon.
Ruby Ring replaces the more commonly seen Reflect Ring as the accessory to generate a constant Reflect status. In the original version, Ruby Ring is found in Accessories 12 on the License Board and costs 60 LP to use. It can be bought for 8,500 gil at the Phon Coast and Mt Bur-Omisace.
In the Zodiac versions, Ruby Ring can be found as a treasure in the Stilshrine of Miriam (Walk of Prescience), Pharos - First Ascent (They Who Thirst Not), Subterra (Abyssal - North) and in Trial Mode Stage 78 & 91 (with the Diamond Armlet equipped), stolen from Judge Bergan (10% chance), and from the Hunt Club sidequest.