Legacy League challenge: level a gem to level 20 question?

Hi,

How do i get this challenge, could i just buy a gem that is level 20 an equip it?
Do corrupted gems work?
Could i buy a level 19 gem and level that up to 20?

Just looking into quick ways to get this challenge any advise would be appreciated.

Thanks
Last bumped on Mar 23, 2017, 11:25:17 AM
You need to hit the button that turns it to level 20, so buying a level 19 Gem works, a level 20 Gem won't.
Ok makes sense thanks for clearing this up.

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