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http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · A piece of jewelry with an etching that reads “18k” or “750” indicates that it is made up of 75 percent gold, while a “14k” or “585” mark indicates the metal is constructed with 58.5 percent gold. Detail of maker’s marks on an Italian 18K yellow and rose gold bracelet, mid 20th century.
http://jeffreylevin.com/jewelry-marks
Here in the United States, no mark is mandatory on any item of precious metal but if a maker chooses to place a purity mark (14k, 18k, etc.) on an item, it is required there be a mark from the maker to show who is responsible for the guarantee of claimed fineness. In the US jewelry trade, this mark is typically called a "trademark".
https://www.leaf.tv/articles/what-are-the-marks-for-18-kt-gold/
The 18K mark is used in the U.S. and Japan. In Europe, 18 karat gold is marked 750, in reference to it being 75 percent pure. Under the percentage system, 10 karat gold is marked 417, 14 karat is marked 583, 22 karat is marked 916, and 24 karat is marked 100. Both the karat and percentage marks are widely used in other parts of the world.
https://www.jewelrynotes.com/marks-18-karat-gold/
The common parts-per-thousand mark for 18K jewelry is 750. You might notice that this number is equal to the percentage equivalent of 18 karats (75%) multiplied by 10. In general, to convert a parts-per-thousand number to karats, divide by 1000 and multiply by 24. Marks for 18K Plated Gold
https://www.langantiques.com/university/jewelry-makers-mark/
Maker’s marks are the initials or name of the manufacturing firm or other representative symbol stamped into a gold, silver or platinum. item. Also called ‘Trademarks,’ they often provide the only evidence that a certain piece of jewelry has indeed been manufactured by a certain jewelry maker.
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