Red Gold

Red Gold is copper and gold mixed. The higher the copper concentration, the redder the gold is.

red_gold

Blue gold is a mix of gold and indium.

blue_gold

There are different methods to making black gold

Wikipedia to the rescue!
Black-colored gold can be produced by various methods:

A range of colors from brown to black can be achieved on copper-rich alloys by treatment with potassium sulfide.[2]

black_gold

More interesting rings here http://www.etsy.com/shop/artmasters?ref=l2-shopheader-name

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