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https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Although the French law requires all gold jewelry to have a minimum purity of 18 karat, items that are intended for export may be marked with the pictorial marks for 9k and 14k. French Export Mark from 1840 to 1879. Image Courtesy of the Hallmark Research Institute.
https://theassayoffice.com/send-us-your-hallmarking/date-letters
The date letters below show the background shape for silver. The same letters were used for Gold, which has been marked in Birmingham since 1824, but with a background of a square with cut corners. There may be some variations in backgrounds during the late 19th century, especially on watch cases.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · 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, …
https://www.bullionbypost.co.uk/index/gold-and-silver/hallmark-date-letters/
Hallmark date letters. Precious metals, such as gold and silver, are generally too soft and malleable for practical use. They are therefore mixed or alloyed with other harder metals. Hallmarks provide proof of an article's precious metal content. British hallmarks date back to medieval times. In 1757, counterfeiting hallmarks was made a felony ...
https://www.jewelry-auctioned.com/learn/jewelry-how-tos/how-to-understand-the-meaning-of-gold-hallmarks
Gold jewelry can vary from 24 Karat to 10 Karat Gold. In fact, 24 Karat Gold is considered 100 % pure gold, while 10 Karat is 41.6% pure gold. A piece of jewelry marked 18 Karat means that it is 75% fine gold. In fact, 24 Karat Gold is 100%; it is essentially not the most attractive mark in jewelry, because pure gold is too elastic.
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