Invigorating Gemstone is a Legendary Gem in Diablo III. It can only be socketed into Amulets and Rings, and drops from Greater Rift Guardians. This gem increases healing received by the character from all sources with each successful hit they land, stacking 10 times and refreshing duration with each stack. Upgrading increases the healing bonus. At rank 25, it also makes the character immune to all forms of Crowd Control.