Love the toned gold, looks awesome!!! Gold isn't inert. It's less reactive than other metals...but it is reactive and does tone.
the color on those is great!! i actually bought that constitution commem from the mint in 1987, i thought the design was cool. dont remember what i bought it for exactly, mine didnt tone at all. it's a small coin with only 1/4 ounce of gold in it (sort of wish they made the coin bigger so i could see the design better)