Colored gold -
Yellow gold, white gold, rose, red, and pink gold, spangold, green gold (or electrum), and grey gold.
- a layer of gold mechanically bonded on the surface of another metal (the gold component typically makes up more than 5% of the item's total weight).
The jewelry should be hallmarked with two numbers - first is the proportion, such as 1/10, 1/20 and second is the gold purity.
For brand new jewelry it is suppose to represent the theoretical amount of gold relative to the solid gold equivalent of the same mass.
To use on the calculator above multiply the weight by the proportion (for example, 1/10 (0.1) or 1/20 (0.05)) and enter the purity as per normal.
For example, for 12K solid gold the gold component would make up 50% of the jewelry's weight (12/24); whereas, 1/10 12K gold filled the gold component would make up 5% of the jewelry's weight (0.1 x 12/24).
If it is only gold filled on a portion of the jewelry's surface then you will need to multiply the weight by this proportion also.
For example, if the proportion of the surface gold filled was only 50% (single-sided) and stamped 1/10 12K gold filled the gold component would make up 2.5% of the jewelry's weight (0.5 x 0.1 x 12/24).
For secondhand jewelry it would be less than the theoretical amount due to wear.
Look for the hallmarks "GF" or "G.F".
Euro (EUR)Andorra, Austria, Belgium, Finland, France, French Guiana, Germany, Greece, Guadeloupe, Holy See (Vatican City State), Ireland, Italy, Luxembourg, Martinique, Mayotte, Monaco, Montenegro, Netherlands, Portugal, Réunion, Saint Pierre and Miquelon, San Marino, Slovenia, Spain, Åland Islands
US Dollar (USD)American Samoa, Ecuador, El Salvador, Guam, Marshall Islands, Micronesia, Federated States of, Northern Mariana Islands, Palau, Puerto Rico, Timor-Leste, Turks and Caicos Islands, United States, Virgin Islands, British, Virgin Islands, U.S.