Board Thread:General Discussion/@comment-24.205.68.226-20141115002013/@comment-11220539-20141201072623

It is stated numerous times throughout Avengers that the scepter gem is powered by the Cube. Plus there was that post on Instagram where James Gunn said he wanted the Power Gem to be red but couldn't because the Aether was already using that color. When the Collector showed the Guardians the gems they didn't have two blue ones.