1.Upgrade the specified legendary gem to 25.It will unlock its’secondary property when reaches level 25.
2.Each legendary gem has the different special property, and it only can be socketed into Rings and Amulets.
3.Gem’s property will upgrade accordingly after each level up.
4.Besides, The legendary gems drop from the final boss of Greater Rifts.
5.Free Paragon Level upgrade.
6.ETA 1-2 Business Days.