Level Up Gems Fast in POE While Making Lots of Currency - YouTube
PoE Level a gem to level 20
If you are doing 5 ways and reducing the cost by leveling gems: level them up from inventory panel. This way you can spam click them and your character won't accidentally move. :
Path of Exile how Active Skill Gems work, and where to find them guide - Polygon
Grab a 15% quality Cane of Kulmak to level gems in offhand : r/pathofexile
Gem of Expansion | Amalur Wiki | Fandom
Feedback and Suggestions - A better way to level up gems - Forum - Path of Exile