Copper creates pink and rose tones in gold.
The more the copper, the deeper will be the effect.
Greenish shades are created by adding silver to gold.
Rose gold and Green gold can be 18-karat or 14-karat but the color is stronger in the 14-karat alloys.
Purple gold. It is referred as amethyst or violet gold. Purple gold is obtained by mixing gold and aluminium in a certain fixed ratio.
Gold content is almost 79% and therefore it is qualified to be referred to as 18K gold.
Blue gold is made as an inter-metallic compound between gold and indium . The gold gets a bluish hue color with this process
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