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Diamondhide is a Blue Magic spell from Final Fantasy XI. It can be learned by Blue Mages at level 67, being a group-wide spell that grants a Stoneskin effect to allies near the caster.


Diamondhide can be learned from Troll enemies who use the ability, which can be found in the Treasures of Aht Urhgan expansion areas. However, the enemies will only use the ability when they have their weapons knocked out of their hands.


Diamondhide gives party members within range the effect of Stoneskin for a duration of 15 minutes. While players can mimic this effect with the Metallic Body spell when under the effect of the Diffusion job ability, Diamondhide's effect can absorb up to 320 HP worth of damage at maximum, making it the stronger method of buffing multiple player and Trust party members. Players must be mindful when playing with White Mages and Scholars, as the effects of the default Stoneskin White Magic spell will override Diamondhide's effect.

Diamondhide costs 3 Blue Magic Points to set. When set, it grants a VIT +1 stat bonus to the player. Unlike most Blue Magic spells, Diamondhide does not produce a job ability with other spells. It takes 7 seconds to cast and can be recast every 90 seconds.


In mineralogy, diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. Diamond is the birthstone for April.