Getting to a level of resilience/stamina where you don't feel too vulnerable is your first priority, once you're confident enough that you're not going to get gibbed so easily then you can start gemming for healing/regen and spell hit.
So yes, if you're undergeared (under 300-400 resilience) get the 18sta/5%stun meta and the resilience enchant, otherwise the current popular meta is
[Insightful Earthstorm Diamond]. The
[Mystical Skyfire Diamond] used to be the most popular but since the 2.4 nerf it's lost much of its appeal. Also a combination of glove enchant / head enchant / gems to get 2-3% spell hit is nice, especially for 5v5 where you're not the only healer and landing mana burns/dispels is more important than raw healing output.
The syntax to link items is (item)delicious chocolate cake(/item) with [ instead of (.