Copper is a duo-chrome polish that shifts from gold to green, with the occasional blue flash along the edges. Although, the shift is difficult to capture on camera, in person this polish is absolutely stunning, and I received many compliments while wearing it.
Revlon Chroma Chameleon polish in Gold and Chanel's Peridot. Having looked at swatches online though, you would not be able to tell the difference between these polishes, so save some money and pick up the Joe Fresh, it's only $4.
This polish was opaque with 2 coats, but I think that 3 would give the best colour and duo-chrome payoff. I found it to be a bit streaky, as you will see in the pictures; I have a bald spot on my ring finger where the second coat pulled the first coat away.