King of Fire - chain armour - Fire set => changes to bone armour
Princess of Fire - chain gloves - fire set => changes to chain gloves
Marksmans stuff - Ranger set (=> bone gloves)
Cutlass Souldrinker - unique item => changes to cutlass
Morpheus ring - unique item IIRC => changes
Zandalor's Inferno - wizard set => name remains, set is taken out, is green now
Zandalor's skin - wizard set => bone armour, still looks like a robe
Headcrusher/unique => name remains, unique taken out
Jarnic on the other hand (staff, robe etc.) are just green items, not unique/set. They remain as they are.
But, only the names change, not their values. I'm currently wearing King of Fire, still looks the same, not like a bone one.