Adamant equipment

Adamant Armor, also known as Adamant Vest or Adaman Bangle, is a recurring armor in the series. It is often a high-rank armor that provides massive defenses, and is usually equippable to everyone.

Final Fantasy IV
Adamant Armor is the most powerful armor in the game, and can only be gotten through trading Pink Puff Tails to the man in Adamant Isle Grotto, which are won from the extremely elusive Flan Princesses. It can be equipped to everyone and provides +100 Defense, +20 Magic Defense, +12 Magic Evasion, +15 to Strength, Stamina, Intelligence, Speed, and Spirit, and resistance to all statuses.

Final Fantasy VII
Adaman Bnagle is a high-rank armor in terms of defense, and can be gotten about halfway through the game by stealing from Adamantaimais. It provides +93 Defense and +23 Magic Defense, and has 2 materia slots, both of which are linked.

Final Fantasy IX
Adaman Vest is a mid-rank armor that can be used by everyone except Steiner and Freya. It provides +14 Defense, +2 Magic Defense, and halves damage from Fire elemental attacks. It teaches the abilities Bird Killer and Stone Killer.

Final Fantasy XII
Adamant Vest is a mid-rank armor that requires 30 LP to use and costs 5900 Gil to buy. It provides +320 HP, +29 Defense, and halves damage from Fire elemental attacks, but makes the user weak to Ice elemental attacks.

Final Fantasy XII: Revenant Wings
Adamant Vest is the 3rd strongest armor for Filo, and provides +60 Defense and Magick Defense, +15 Speed, and resistance to Fire elemental attacks, but makes Filo weak to Water elemental attacks.

Final Fantasy Tactics Advance
Adaman Armor is the 3rd strongest armor in the game, and provides +58 Defense and +3 Magic Resistance.

Final Fantasy Tactics A2: Grimoire of the Rift
Adamant Armor is the 3rd strongest armor in the game, and provides +54 Defense and +3 Resistance.