SA on amaranthine shaper

hi, i think there is a bug with amaranthine shaper SAs, L2 wiki and firends told me than i need a red soul crystal r99 to put guidance on my ama shaper, but ishuma and blacksmith of mammon told me i need a blue one. there is a bug? if i put guidance with blue soul crystal and if its true there is a bug, when fixed my sa will change or stay? idon't want to waste 900gemR so please give me a constructive answer. ty