Board Thread:Questions and Answers/@comment-7657843-20150509205259/@comment-1298029-20150510195328

As for whether each gem has 6 powers, I never noticed anything to that effect. We don't know the full extent of the abilities of any of them, so I don't think we can say each has exactly 6. Do we even know at least 6 powers for each gem? Also, what's a different power, and what's a different manifestation or use of the same power? That's usually pretty arbitrary.

(In real science, categorization like this is not at all easy and there are rigorous rules for determining when something is a different basic property or a different manifestation of the same property. Sometimes, such classifications get revised decades after their creation or previous update, when new research shows that the original assignment of categories was wrong (either way, can be that something previously thought separate is found to be related, or something previously thought related is found to be separate, although the former is probably more common).)