18K gold contains 18 parts gold and 6 parts of another metal(s), making it 75% gold.
Color of Gold Alloy Composition
Yellow Gold (22K) Gold 91.67%
Silver 5%
Copper 2%
Zinc 1.33%
Red Gold (18K) Gold 75%
Copper 25%
Rose Gold (18K) Gold 75%
Copper 22.25%
Silver 2.75%
Pink Gold (18K) Gold 75%
Copper 20%
Silver 5%
White Gold (18K) Gold 75%
Platinum or Palladium 25%
White Gold (18K) Gold 75%
Palladium 10%
Nickel 10%
Zinc 5%
Gray-White Gold (18K) Gold 75%
Iron 17%
Copper 8%
Soft Green Gold (18K) Gold 75%
Silver 25%
Light Green Gold (18K) Gold 75%
Copper 23%
Cadmium 2%
Green Gold (18K) Gold 75%
Silver 20%
Copper 5%
Deep Green Gold (18K) Gold 75%
Silver 15%
Copper 6%
Cadmium 4%
Blue-White or Blue Gold (18K) Gold 75%
Iron 25%
Purple Gold Gold 80%
Aluminum 20%
There are other less popular alloys. As you can see 18k gold can be an alloy of many different things. Rhodium and other exotic metals are plated on white gold for durability and to enhance the white color
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« Last Edit: March 25, 2009, 10:47:23 pm by highaltitude »
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