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https://www.langantiques.com/university/jewelry-makers-mark/
Jewelry Maker’s 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 …
https://truval.com/blog/jewelry-identification-marks-hallmarks-makers-marks/
Gold Jewelry Marks Gold jewelry will often have different numbers inscribed or etched in them to signify the metal’s karat content. A ‘750’ marking means that a piece is 18-karat gold while ‘585’ signifies 14 karats and ‘417’ 10 karats.
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 …
https://www.globalgemology.com/g.html
GUY HARVEY JEWELRY Hallmark(s): "Guy Harvey" Information: Nautora, the makers of Guy Harvey Fine Jewelry, was founded by Robbins and Danielle Rees in 1981, in Little Washington, North Carolina. Works primarily in silver, but vintage pieces were produced in gold.
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.
https://www.globalgemology.com/t.html
T. TACORI. Hallmark (s) : "Tacori", "Tacori IV". Information: Founded in 1969 by Haig Tacorian, in Glendale, California. Began as a pearl dealer and later expanded into the diamond market. Their "Tacori IV" jewelry line was a featured line on the QVC shopping network. Works primarily in gold …
https://www.langantiques.com/university/hallmarks-makers-marks-resource-list/
Chaffers (1899), Gilda Aurifabrorum: A History of English Goldsmiths and Plateworkers, and their Marks Stamped on Plate. Chaffers (1905), Hall Marks on Gold & Silver Plate. Cripps (1894), Old English Plate: Its Makers and Marks. Hayden (1917), Chats on Old Silver.
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
When one finds a purity mark of 18k, it indicates that the alloy to create the jewelry from is made out of 18 parts of gold and 6 parts of other metal. To translate that to percentages we divide 18 by 24 and multiply it by 100. In the case of 18 karat gold, the simple equation will be (18/24) x 100 = 75%.
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