Board Thread:General Discussion/@comment-26542873-20150629172006/@comment-26530393-20150630042034

I would say that essentially, these larger fusions are a sum of their parts, regardless of how they started. For example, if Ruby and Amethyst fuse into whatever, then fuse with Sapphire, I believe they would still be Sugilite due to the fact that all three distinct personalities are there.

So, to answer the question, they would not be "Fusions of a Fusion," but rather just fusions involving more than two Gems.