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https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Apr 29, 2021 · For gold, the stamps are 375, 585, 750, 916, 990 and 999. For silver, the stamps are 800,925,958 and 999. For platinum, the stamps are 850, 900, 950 and 999. Please refer to the photo to see what the stamps look like as well as the essay’s office stamp. That covers the most common stamps on gold jewelry…Estimated Reading Time: 7 mins
https://www.costumejewelrycollectors.com/vintage-costume-jewelry-research/costume-jewelry-marks/costume-jewelry-history-jewelry-marks-h/
Aug 24, 2019 · Mark: Superimposed “H” over “G” in a rounded corner square shape — until c. 1955. Mark: Chr. Dior with the date in an oval tag was used for jewelry made for Dior. Founded in 1907 by Heinrich Henkel and Florentine Grossé in Pforzheim, Germany. Manufactured jewelry …Estimated Reading Time: 7 mins
https://www.khollisjewelers.com/precious-metal-stamps-hallmarks
In the context of gold jewelry, "plumb" is an old-fashioned term that means that the fineness or purity level of the gold content is precisely what is stamped on the item. The word "Plumb" or the letter P still sometimes follows the metal stamp (e.g., "14k Plumb," "14KP").
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · The date letter stamp, a requirement for British jewelry until 1999, is useful to know if you need to date a piece of vintage or retro jewelry. Silver pieces imprinted with a lion denotes 92.5 percent silver — thus sterling silver — while the Britannia mark means that it has 95.8 percent pure silver.
http://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
Feb 20, 2013 · Authentic gold jewelry should have a stamp to indicate the purity of the gold in the piece. This mark can be in several different formats. For example: 585, 14kt and 14K all mean 14 karat gold. All of these formats are easy to understand, except possibly the 3 digit number format.
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