Talk:Master Master Master Master!/@comment-184.164.116.12-20190927153152/@comment-39326604-20200219100218

No but you get the Turned Every Stone achievement for collecting all of them.

As for the other question, it's because Viper Armor from Hearts of Stone is already on par with Grandmaster gear, Viper Armor is level 39 while any other Grandmaster Armor is level 40. So the difference would be minute, hence they never added it.