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Gold Markings

 

 

          1) Who Grades Gold?

    The Federal Trade Commission is the U.S. consumer's protection against fraud in jewelry appraisal, identification and grading standards. The agency works diligently with the jewelry industry to unravel the mystery of understanding the stamped hallmarks that guarantee the purity of metal used by jewelers.


    2) What is a Karat?

    The purity of gold is measured in karats, which are expressed in units of 24ths. Thus, pure gold is 24-karat or 100 percent gold, 18-karat is 75 percent gold, 14-karat is 58.5 percent gold, and so on.

    Gold jewelry is priced according to its purity, or karat weight. A karat, or carat, is 1/24th part of pure gold. This pure gold is commonly alloyed with other metals in increase its hardness and decrease its cost.

    In other words:

    • 10K gold should be priced much less than 18K gold. (The lower the karat the less expensive - unless fancy design.)

       

    • 24K gold is rather soft and needs extra care to avoid damage. It is pure gold (occassionally marked "pg").


    3) What Types of Gold are there?

    COLORED GOLDS
    There is no such thing as naturally occurring rose, white or green gold. Gold itself is only one color: yellow. All of other "colors" are a mixture of pure 24K yellow gold with various other metals. The percentage of the other metals (copper, silver, zinc, nickel) produces the different shades of gold. Any karat other than 24K gold (pure gold) is called an "alloy".


    YELLOW GOLD
    24k gold by definition will always be "Yellow Gold" as it is pure gold. However, one can still maintain a color close to this yellow while adding other metals to create 10K, 14K and 18K yellow gold. These alloys will be more durable than the pure 24K gold.


    ROSE GOLD
    Rose gold, known by other names such as pink gold or red gold, is created by increasing the copper-colored alloys and decreasing the silver-colored additives.


    WHITE GOLD
    By increasing lighter alloys of silver, zinc, nickel and copper tone down the yellow gold. The resulting 14K white gold contains as much gold as 14K yellow gold but is nearly white in color, though it still carries diminutive yellowish hint.


    GREEN GOLD
    With its subtle, natural appearance, green gold is best showcased in jewelry that combines yellow, white and pink gold. An alloy of pure yellow gold and pure silver produce the green tint. For durability, harder metals such as nickel or zinc can be used. To create true 14K green gold, jewelers use 14 parts yellow gold and ten parts silver. 18K green gold would contain eighteen parts yellow gold and six parts silver.

    Green gold can be hard to find.


    taken from: http://www.jewelrymall.com/newsletters/050426.html  March-25-2010