How to get a legendary gem level ?

[User5981]

I've found how to get a socketed legendary gem level but can't find out how to get a legendary gem level.

[Xewl]

This doesn't make much sense, you just need to do greater rifts to level legendary gems.

[User5981]

This doesn't make much sense, you just need to do greater rifts to level legendary gems.

Does this make more sense ? :
I'm working on a TurboHUD plugin and need to know how to get the level (data) of a legendary gem to pass in a variable.
This is not a question about the game.


Edit :
item.JewelRank
as always... easier than I thought...