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https://www.mygoldguide.in/know-hallmark-gold-us
May 15, 2018 · The karat quality mark indicates the purity of gold. 10k – 10 karat gold is the lowest karat gold available in the US, and is composed of 41.7% gold among other metals. 14k – 14 karat gold is one of the most popular gold purities for gold jewellery. 14 karat gold consists of 58.5% gold. 18k – 18 karat gold consists of 75% gold.
https://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
Feb 20, 2013 · Jeweller’s Marks. A lot of jewelry will have several stamps or marks. Often there is one stamp to indicate the purity of the gold (“14K”, as mentioned above). The purity mark can be accompanied by a second mark called a maker’s mark or a jeweller’s stamp. These are custom stamps or engravings placed in jewelry by whomever manufactured it.
https://www.leaf.tv/articles/how-to-identify-gold-jewelry-by-number-marks/
American jewelry is often marked by karat, stamped into the inside of a ring or bracelet, on the edge of earrings or the back of a charm. If the jewelry is marked 10k, that's the minimum mark used in the United States. Older gold may not be stamped but is usually 9k.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Common Jewelry Marks Gold Purity Marks. Purity marks on gold jewelry will consist of a two-digit number followed by the letter “k,” or a three-digit number. The letter “k” refers to karats, where pure gold is composed of 24 karats (24k).
https://www.jewelry-auctioned.com/learn/jewelry-how-tos/how-to-understand-the-meaning-of-gold-hallmarks
Originally, the gold marks were impressed by a union of goldsmiths. These goldsmiths are the individuals who examine or check the purity of the gold product, and they are the people that mark the gold in their guild hall. By this process, the name “hallmark” was originated. Nowadays, these hallmarks are managed by assay offices.
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
One can usually easily distinguish gold marks used in the USA from those in Great Britain by the abbreviation. The UK spelling is “carat” which is shortened as “ct”, while in the USA the abbreviation is “k” for “karat”. On jewelry objects made in the USA before circa 1900, it is not common to find any marks.
https://www.langantiques.com/university/hallmarks-makers-marks-resource-list/
Reference Books: Maker’s Marks. American Jewelry Manufacturers.Dorothy T. Rainwater. West Chester PA: Schiffer Publishing Ltd. 1997. ISBN 978-0887401206
https://www.globalgemology.com/a.html
Information: A.J. Goldfarb, Inc. is a manufacturer of jewelry findings that was founded in 1949, in New York City. Works in gold, silver, and base metals. Information: A. Jaffe, Inc. was founded in 1892 by Albert Jaffe, in New York City. Works primarily in gold and platinum.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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http://junkboxtreasures.com/research/jewelry/graphic_marks/graphic_marks.html
Aarre & Krogh Mark. Aarre & Krogh Mark. Allsopp Brothers. American Jewelry Chain. Marshal Metal Manufactory Ltd. Alwand Vahan. Andreas Daub (Germany) Attwood & Sawyer. Unknown.
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