The ring does not work if equipped by your follower. The goblin is summoned when equipping the ring and follows you around as long as the ring stays equipped, unequipping it will reset the item counter.

Does ancient Puzzle Ring make a difference?

Puzzle Ring is a legendary ring in Diablo III. It requires character level 29 to drop. ... 5, using an Ancient or Primal ring will, conversely, increase the difficulty and reward of the Vault, replacing every single Vault Sentry with a Treasure Goblin. Visually, the Ancient Vault will be much darker.

How do you farm the Puzzle Ring?

Puzzle Ring in the cube and open a portal to Greed's Realm, where you will sprint past everything until you get to the boss itself and just kill him (you can do this on Normal difficulty as well). He drops 2 legendaries and doesn't give you too much XP, and with the small loot pool an ethereal is very likely.