Board Thread:Introductions/@comment-26864191-20150807062603/@comment-28584561-20150807113516

Actually, the question has been answered and is confirmed that Fusions do in fact "stack".

If Garnet, Amethyst, and Pearl fused, it would result in the formation of Alexandrite. If Opal fused with Garnet, the resulting fusion would still be Alexandrite. If Sardonyx and Amethyst fused, it would still result in Alexandrite. It's the same with Sugilite and Pearl.