- Patch 4.2.0 (2011-06-28): Now stacks to 20.
- Patch 4.0.1 (2010-10-12): Now grants Intellect instead of Spell Power. Renamed from Unstable Sapphire.
- Patch 3.0.2 (2008-10-14): All items and effects which grant bonuses to spell damage and spell healing are being consolidated into a single stat, Spell Power.
- Patch 2.1.0 (2007-05-22): Added.