A stamp reading 18KGP means that the jewelry is gold plated, so an 18KGP white gold item would be plated with 18 karat white gold. The metal underneath the gold is usually copper or silver, but these can diffuse into the gold and tarnish the color.Know More
Copper has a nickel-plated layer before adding the gold, while silver metals usually have layers of copper and then nickel. The nickel is a barrier metal that can help stop the primary metal from ruining the finish of the gold. If the barrier metal is not used, it can take only a few months to a few years before the gold is tarnished.
Karat is a term used to describe the purity of the metal and 18 karat gold is gold mixed with other metals, making it 75 percent pure. Each karat represents 1/24th of the gold's purity, or 4.1667 percent. Twenty-four karat gold is the purest, and 12 karat gold is 50 percent pure. Gold jewelry is usually sold at between 9 and 18 karat, and in the U.S. the minimum value for gold is 10. Gold is mixed with other metals in jewelry because gold as a metal can be damaged easily. Twenty-four karat gold is usually reserved for ceremonial or display use.Learn more about Precious Metals & Gems
Aside from never using the item, it is nearly impossible to prevent some white gold pieces from turning yellow. This is particularly true for jewelry. White gold jewelry, especially rings, has a tendency to gradually turn yellow due to natural erosion caused by friction and normal wear and tear.Full Answer >
M & M Gold Exchange notes that jewelers and others have long used the same tests, including applying nitric acid and attempting to attach a magnet to a metal piece, to verify an item is made of real gold. In the United States, anything less than 10 karats is not considered real gold.Full Answer >
The number 585 is stamped on European gold jewelry to indicate that the jewelry contains 58.5 percent gold. This is comparable to the U.S. 14K marking that indicates that a piece contains 14 parts gold and 10 parts of one or more different metals, which means that it is 58.3 percent gold.Full Answer >
Clean gold jewelry by soaking it in a mixture of mild dish soap and club soda for five minutes. Use a soft-bristle toothbrush to clean the crevices and settings. Rinse the jewelry with water, and dry it with a soft cloth.Full Answer >