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https://www.liveabout.com/what-does-gold-filled-mean-2043648
Mar 01, 2018 · Gold filled —For something to be considered gold filled, the gold content must exceed or equal 5%. This percentage is the minimal amount needed to legally stamp your jewelry with "1/20 14KGF." If you see that hallmark, your piece would be 5% gold. However, most antique jewelry that is gold filled has significantly more gold than that.Estimated Reading Time: 3 mins
https://www.agelessheirlooms.com/faq-what-does-gold-filled-mean/
Jan 19, 2014 · When something is gold filled, it has a thick sheet of gold applied to a base metal, 50 to 100,000 times thicker than gold plating, and in order for something to be considered Gold Filled, it must have a gold content of at least 1/20th the total weight of the item. Antique Victorian Gold Filled Crescent Locket, c. 1890Reviews: 6
https://www.stuller.com/articles/view/definition-of-plated-and-filled/
Jul 23, 2021 · The term gold-filled refers to the manufacturing process in which a sheet of base metal, usually brass, is mechanically bonded with thinner sheets of gold. A "sandwich" is formed by mechanically bonding a layer of gold on both sides of brass. This "sandwich" is then cold worked by rolling until a much thinner gauge metal is achieved.
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