Greater Iron Rune doesn't work

It seems that Greater Iron Rune does not increase defences at least on a helmet.
(Probably other Iron Runes too)

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Zanozus#7669 wrote:

It seems that Greater Iron Rune does not increase defences at least on a helmet.

Before I try going in-game to test this, what's your basis for saying this?

If you're trying to increase your Armour/Evasion by putting the rune into a helmet only granting Energy Shield, for example--it doesn't work like that. The rune will only increase the defenses of the helmet itself, and the change should be reflected on the item itself.