As a Latin teacher, my reflex is to say “diplomae.” But that’s probably not it, since diploma actually means “doubled” as in “folded.” It’s a participle (a verb used as a noun.) It’s actually greek, from δίπλωμα (therefore “a thing doubled.”)
So “diplomas” is an acceptable plural, and I’ll let you get away with “diplomae” (you could argue either.) But the most proper plural in my opinion is “diplomata.”
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