Looks like either copper, or "Black Hills gold." While it may be stunning, it seems like a bit of a wank job to me. I can think of plenty of things to better spend my money on than gold plating my espresso machine. Maybe a better grinder?
I remember when it was the rage to get your BMX frame chromed. I stuck with my tried and true stainless steel Mongoose frame. It was heavier than the chrome or aluminium alloy bike frames but 10 times sturdier.