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I use brown niobium ear wires for copper, brass and bronze jewelry.
Niobium is supposed to be one of the least allergy causing metals
for ear wires. I also buy brown niobium wire and make my own ear
wires. I tape my pliers so the anodized color does not come off as I
am forming my earwires. Niobium is pretty stiff so it works pretty
well for ear wires.
You can also patina Sterling Silver ear wires to a brown color. I
have heard some folks use clear nail polish to cover the surface of
brass or copper ear wires, but that seems like a lot of work. No one
has ever returned or complained about the brown niobium ear wires so
those are what I stick with.