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https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Hallmarks on Period Jewelry. For estate jewelers and jewelry historians, hallmarks provide for an extra source of information to accurately date a jewelry object and determine by whom it was made. The most encountered hallmark on jewelry is undoubtedly the “purity” mark which indicates the total amount of gold or silver used to manufacture ...
https://www.antique-jewelry-investor.com/antique-jewelry-hallmarks.html
An introduction to Antique Jewelry Hallmarks on Antique Gold Jewelry is essential reading for any Investing in fine Jewelry fun-journey.. Identifying marks on Jewelry is challenging, for novice and expert alike, and that's the reason I started the Hallmark Challenge for those elite group of Hallmark- Holmes Experts out there who like a dare.
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. Sold for $3,000 via Alex Cooper (October ...
https://www.langantiques.com/university/hallmarks-makers-marks-resource-list/
San Francisco, CA: Hallmark Research Institute, 2010. ISBN 978-0979762819; Books Available to Read On-Line European Marks General. Markham (1898), Hand Book to Foreign Hall Marks on Gold and Silver Plate; Redman (1893), Illustrated Hand Book of Hall-Marks and Date-Letters from 1509 to 1920 on Ecclesiastical and Domestic Plate; German marks
https://www.myclassicjewelry.com/blog/vintage-jewelry-marks/
Aug 15, 2014 · Vintage jewelry from other countries may have European purity marks, such as “585” for 14K gold and “750” for 18K gold, as shown in the photo below. Various gold purity marks commonly found on vintage and antique jewelry
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