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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, where pure gold is composed of 24 karats (24k).
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. Costume Jewelry Makers Marks.
https://goodjewelleryguide.com/jewelry-hallmarks-guide/
Jan 21, 2021 · There are some generally accepted rules and signs around the world. If you have gold jewelry, you should see markings like 18k, 14k, 10k, 750, 585, or 375. If you have silver jewelry, you should see markings like 925 or 800. Although there are many distinctive features, this is the most clearly distinguished by users.
https://www.leaf.tv/articles/what-is-the-meaning-of-numbers-on-jewelry/
The United States only adopted hallmarks in the early 1900s. European jewelry usually displays a three-number digit which marks the purity percentage of the metal, while U.S. jewelry opts for 18K, 14K, or 10K hallmarks. Today, very little jewelry is sold without a hallmark number on it.
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