Board Thread:General Discussion/@comment-4224349-20150115232311/@comment-4182232-20150121034519

Kevin125 wrote: How is garnet a fusion gem? There's a thread explaining it in detail here: http://steven-universe.wikia.com/wiki/Thread:41302

Here's the cliffnotes version, two gems, asymetrical design, blue and red gem react to open the temple door for her, ect.