Board Thread:Ask the Staff/@comment-28959375-20160801214513/@comment-26831137-20160802083004

I'd argue a corrupted Gem can only be healed Mentally, it would require Steven to enter a corrupted Gems Mind like he did the Cluster, and try to reverse the damage there. I think Kikis Pizza Delivery was a hint to this, enter the mind and defeat the inner demon of the Gem