Mystical Skyfire Diamond

A Mystical Skyfire Diamond is a meta gem with a 15% chance to grant 6 seconds of 320 Spell Haste Rating, with a 45 second internal cooldown. The buff given is called focus. The gem can proc off instant casts, but they will not consume focus.

Source
This item is crafted with Jewelcrafting (365); taught by Design: Mystical Skyfire Diamond, a world drop.