Zuriel's robe top

High alchemy turns Zuriel's robe top into 300,000 gp. Buying one at 10,000,000 gp (its guide price, as it has not traded today) and casting with a nature rune at 138 gp costs 10,000,138 gp. That is a loss of 9,700,138 gp per cast at its guide price, so it is not worth alching for profit right now.