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http://www.petershakes.com/about/precious_metals_for_jewellery
Gold alloys for jewellery are made up of a percentage of pure gold and the remainder is made up of combinations of copper, silver, palladium and/or other metals. The carat rating of an alloy refers to the percentage of gold in the alloy. Those percentages are: 9ct = 37.5% gold and 62.5% other metals.
https://www.americangemsociety.org/precious-metal-jewelry/
Platinum is a type of precious metal jewelry that costs more than gold. It usually is mixed with other similar metals, known as the platinum group metals: iridium, palladium, ruthenium, rhodium and osmium. Different markings are used on platinum jewelry as compared with gold jewelry, based on the amount of pure platinum in the piece.
https://www.jewelrythis.com/faq/precious-metals/
The primary precious metals are gold, silver, platinum, and palladium. They are used for a variety of industrial purposes, for investment and for jewelry making. When used in jewelry, precious metals are usually mixed with other metals to create alloys that are stronger and more durable.
https://www.gemsociety.org/article/jewelry-metals-overview/
May 07, 2020 · Metals commonly alloyed with gold for jewelry purposes include: silver, copper, nickel, iron, zinc, tin, manganese, cadmium, and titanium. In addition to enhancing gold’s strength, alloying changes some of its other properties, too. For example, some gold …Gold Color: Alloys
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