The gilded full helm is a gold-plated version of the rune full helm. It has the same stats as the rune full helmet, and only differs in appearance. It requires 50 defence to wear.
The gilded set is one of the few rune armour sets that is members only. It can either be purchased from other players or received as a reward from a level 3 clue scroll. This piece of armour cannot be made using any skill, but you may fake it by painting a rune helmet with the Varrock family crest. Although, it will have a black plume instead of a gold plume.