A complete list of the Ring armor available in Final Fantasy X. The abilities that come attached to each armor that drops are somewhat randomized, but the common abilities are listed below.

Check out the Abilities for more information on abilities that you can find on weapons and armor.

Ring	Abilities
Adept’s Ring	Any two: HP +X% MP +X%
Aegis Ring	Fireproof Waterproof Lightningproof Iceproof
Alert Ring	Sleepproof - or - Sleep Ward
Arcane Ring	Break HP Limit
Assault Ring	Any three: Auto-Shell Auto-Protect Auto-Reflect Auto-Regen Auto-Haste
Barrier Ring	Any three: Fireproof Waterproof Lightningproof Iceproof
Blessed Ring (Version 1)	Auto-Shell Auto-Protect Auto-Reflect Auto-Regen
Blessed Ring (Version 2)	Zombieproof - or - Zombie Ward
Blue Ring	Waterproof - or - Water Ward
Bright Ring	Darkproof - or - Dark Ward
Cerulean Ring	Water Eater
Collector’s Ring	Master Thief
Crimson Ring	Fire Eater
Curative Ring	Auto-Med
Defending Ring	Any two: Darkproof Silenceproof Sleepproof Poisonproof Stoneproof Deathproof Zombieproof Slowproof Confuseproof Berserkproof
Diamond Ring	Defense +X% Defense +X% Defense +X% Defense +X%
Echo Ring	Silenceproof - or - Silence Ward
Elemental Ring	Any two: Fireproof Waterproof Lightningproof Iceproof Fire Eater Water Eater Lightning Eater Ice Eater
Emerald Ring	Any two: Magic Defense +3% Magic Defense +5% Magic Defense +10% Magic Defense +20%
Faerie Ring	Any three: Darkproof Silenceproof Sleepproof Poisonproof Stoneproof Deathproof Zombieproof Slowproof Confuseproof Berserkproof
Forbidden Ring	Any four: Darkproof Silenceproof Sleepproof Poisonproof Stoneproof Deathproof Zombieproof Slowproof Confuseproof Berserkproof
Fortitude Ring	HP +X% HP +X% HP +X% HP +X%
Glorious Ring	[Empty Slot] [Empty Slot] [Empty Slot]
Gold Ring	Any two: Defense +3% Defense +5% Defense +10% Defense +20%
Guardian Ring	HP +X% HP +X% HP +X% [Empty Slot] (Optional)
Haste Ring	Auto-Haste - or - SOS Haste
Healing Ring	Auto-Potion Auto-Med
Holy Ring	Ribbon
Light Ring	Slowproof - or - Slow Ward
Lucid Ring	Confuseproof - or - Confuse Ward
Mage’s Ring	Any two: MP +3% MP +5% MP +10% MP +20%
Magic Ring	MP +5% - or - MP +10%
Magical Ring	MP +X% MP +X% MP +X% MP +X%
Marching Ring	Any two: Auto-Shell Auto-Protect Auto-Reflect Auto-Regen Auto-Potion Auto-Med Auto-Phoenix
Medical Ring	Curseproof
Metal Ring	Defense +3% - or - Defense +5%
Moon Ring	Any two: SOS Shell SOS Protect SOS Reflect SOS Haste SOS Regen
Mystical Ring	Break MP Limit
Mythril Ring	Defense +X% Magic Defense +X%
NulBlaze Ring	SOS NulBlaze
NulFrost Ring	SOS NulFrost
NulShock Ring	SOS NulShock
NulTide Ring	SOS NulTide
Ochre Ring	Lightning Eater
Onyx Ring	Magic Defense +10% - or - Magic Defense +20%
Peaceful Ring	No Encounters
Pearl Ring	Magic Defense +3% - or - Magic Defense +5%
Phantom Ring	Any three: Fire Eater Water Eater Lightning Eater Ice Eater
Phoenix Ring	Auto-Phoenix
Platinum Ring	Defense +X% Defense +X% Defense +X% [Empty Slot] (Optional)
Protect Ring	Auto-Protect - or - SOS Protect
Rainbow Ring	SOS NulBlaze SOS NulTide SOS NulShock SOS NulFrost
Recovery Ring	HP Stroll
Red Ring	Fireproof - or - Fire Ward
Reflect Ring	Auto-Reflect - or - SOS Reflect
Regen Ring	Auto-Regen - or - SOS Regen
Ring	[Starting Armor - No Abilities]
Ring of Hope	HP Stroll MP Stroll
Ruby Ring	Magic Defense +X% Magic Defense +X% Magic Defense +X% Magic Defense +X%
Sapphire Ring	Magic Defense +X% Magic Defense +X% Magic Defense +X% [Empty Slot] (Optional)
Saviour Ring	Auto-Potion Auto-Med Auto-Phoenix
Seeker’s Ring	HP +5% - or - HP +10%
Serene Ring	Berserkproof - or - Berserk Ward
Serum Ring	Poisonproof - or - Poison Ward
Shaman Ring	Auto-Potion
Shell Ring	Auto-Shell - or - SOS Shell
Sheltering Ring	HP +20% - or - HP +30%
Shining Ring	Any four: SOS Shell SOS Protect SOS Reflect SOS Haste SOS Regen
Silver Ring	Defense +10% - or - Defense +20%
Snow Ring	Ice Eater
Soft Ring	Stoneproof - or - Stone Ward
Soldier’s Ring	Any two: HP +3% HP +5% HP +10% HP +20%
Solomon Ring	Break HP Limit Break MP Limit
Sophia Ring	Fire Eater Water Eater Lightning Eater Ice Eater
Sorcery Ring	MP +20% - or - MP +30%
Soul Ring	Deathproof - or - Death Ward
Spiritual Ring	MP Stroll
Star Ring	Any three: SOS Shell SOS Protect SOS Reflect SOS Haste SOS Regen
Tetra Ring	[Empty Slot] [Empty Slot] [Empty Slot] [Empty Slot]
Treasure Ring	Pickpocket
White Ring	Iceproof - or - Ice Ward
Wide Ring	[Empty Slot] [Empty Slot]
Wizard Ring	MP +X% MP +X% MP +X% [Empty Slot] (Optional)
Yellow Ring	Lightningproof - or - Lightning Ward