Level
5th
Casting Time
1 Action
Range/Area
Touch
Components
V, S, M *
Duration
Instantaneous
School
Abjuration
Attack/Save
None
Damage/Effect
Exhaustion
You touch a creature and magically remove one of the following effects from it:
- 1 Exhaustion level
- The Charmed or Petrified condition
- A curse, including the target’s Attunement to a cursed magic item
- Any reduction to one of the target’s ability scores
- Any reduction to the target’s Hit Point maximum
So.... doesn't cure disease, poison, blindness, deafness. Not very "greater" to me.
What exactly does it mean by Diamond Dust worth 100+ GP?
I assume it means "an amount the DM considers 100gp worth". Whereas in-game the dust might not be worth the same amount depending on who you ask.
In my experience, it's usually just a player expending 100 gold in a place where they could reasonably access diamond dust (e.g. any big city)
Curing these conditions is the purview of lesser restoration. This spell is geared toward conditions that last longer/are worse/are hard to get rid of otherwise. Also, several other effects from spells and suchlike state that they can be removed with greater restoration in their descriptions (such as feeblemind/befuddlement). That said, if for some reason a player wanted to expend a 5th level spell slot and a costly material component to cure something that can be removed with a 2nd level spell, I would probably allow it.