Tourmaline Ring is an accessory in Final Fantasy XII that makes the wearer immune to Poison. In the Zodiac versions, the armlet also makes the wearer immune to Sap and halves Ice damage to the wearer. Wearing multiple pieces of equipment that all give the same elemental resistance does not stack, but certain different types do: Halve + Weakness = Normal damage, meaning equipping Tourmaline Ring with Adamant Hat or Adamant Vest makes the wearer take normal damage from Ice. Halve + Absorb absorbs half damage, but the only equipment piece that absorbs ice is the Gendarme.
In the original PlayStation 2 versions, the Tourmaline Ring can be bought for 300 gil from Dalmasca Estersand, Dalmasca Westersand (after the Leviathan), and Dreadnought Leviathan. It is found as a treasure in Nalbina Dungeons' Confiscatory (always appears ). Basch joins the party with the Tourmaline Ring equipped.
In the updated Zodiac versions, the Tourmaline Ring can be bought for 300 gil from Dreadnought Leviathan, Dalmasca Westersand (after Ondore's estate), Dyce in Nam-Yensa Sandsea and Tomb of Raithwall, Jahara, Mosphoran Highwaste (after defeating Judge Bergan), and the "secret shop" in Necrohol of Nabudis.
Tourmaline Ring is still found in a treasure in Nalbina Dungeons' Confiscatory (always appears), and now also in Ozmone Plain's Haulo Greens (75% chance to appear, 50% chance for gil, 50% chance the item treasure is Tourmaline Ring without the Diamond Armlet), Stilshrine of Miriam's Walk of Sky (two chests and both always appear), and Pharos - Second Ascent's Station of Suffering (75% chance to appear, 40% chance for gil, 59% chance the item treasure is Tourmaline Ring without the Diamond Armlet), as well as in Trial Mode stages 18 and 31 with the Diamond Armlet. It can also be stolen Deathgaze (55%) in Trial Mode Stage 65.
The Tourmaline Ring makes the wearer immune to Poison (damages the target for 6.25% of their max HP at certain intervals), as well as Sap in the Zodiac versions (decreases the afflicted's HP at a fixed rate of 10HP/second), both passively damaging the afflicted's HP. It is useful against enemies that use Poison and Sap. An alternative would be to set up gambits for Antidotes, Poisona, or Esunaga, or Regen for Sap. Ribbons also make the Tourmaline Ring redundant as they protect against all status ailments, but are also available much later into the game.
In the Zodiac version, the accessory also halves Ice damage, which is usually the best ice-protection the player can have, as no equipment has Absorb:Ice, leaving only the Gendarme that absorbs all elements. Tourmaline Ring is useful against enemies that use Ice, especially Mateus, who uses both Ice and Sap.
Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminum, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and comes in a wide variety of colors.