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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/
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://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.
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Look for other marks that indicate 14K jewelry, such as “585” and “14KP.” Determine whether jewelry is 10-karat gold by looking for a “10K” mark, which indicates jewelry is 41.6 percent pure gold, or 10 parts pure gold out of 24. Remember that 10-karat gold may also be marked “417,” “16” or “10KP.”
https://www.leaf.tv/articles/how-to-identify-gold-jewelry-by-number-marks/
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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