Gold Colors and finishes: Pure 24 karat gold is Yellow in color, when the purity is lowered, by adding different alloys, the color of the gold can be changed to reflect the color of the alloy. i.e. if we were to convert 24k gold to 22k gold we would be adding about 8.4% alloy, which would now make it 91.6 percent pure (22 karat). The addition of alloy has various purposes, one is to give it hardness, to make the gold jewelry stronger, as pure gold is very soft, the other would be to change the color, e.g. if copper would be added to alloy then the gold would appear reddish, instead of the yellow or if any of the white metal was added to the alloy it would make it appear white. This is not to be confused with the finishing, which are just on the top surface of the jewelry, which are mostly different types of hand paints or coatings, used like paint on the surface to enhance just the look, e.g. to give it an antique look, underneath the paint or coating, it would be solid yellow gold.
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