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https://jewelry.lovetoknow.com/about-jewelry/understanding-markings-jewelry
You may notice the following metal stamps or markings on your jewelry: Marking. What It Means. A number, followed by "k" or "karat". The item is gold. The purity of the gold varies by the karat number…Author: Kate Miller-Wilson
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Note that a “950 Platinum” mark indicates that jewelry is 95 percent pure platinum, or 950 parts pure platinum out of 1,000. Identify this type of jewelry by any of these other marks: “Plat 950,” “Pt950,” “PLAT,” “PT,” “950 Plat” or “950Pt.”
https://www.leaf.tv/articles/how-to-identify-gold-jewelry-by-number-marks/
Look for a number followed by "k," for example "12k," using a loupe or magnifying glass. American jewelry is often marked by karat, stamped into the inside of a ring or bracelet, on the edge of earrings or the back of a charm. If the jewelry is marked 10k, that's the minimum mark used in the United States.
https://news.internetstones.com/harmonized-system-codes-hs-codes-for-the-gem-and-jewelry-industry/
The first 6 digits of the HS Codes are used universally. However individual countries are allowed to extend the number of digits to 8 or 10 for customs purposes- that is for tariff and statistical needs. The first 4 digits of the HS CODES (also known as the heading) used for …
https://www.leaf.tv/articles/what-is-the-meaning-of-numbers-on-jewelry/
The number found on jewelry is a karat hallmark and tells you how much of a metal is in that piece. Hallmark Standards. A hallmark is an indication of a piece of jewelry’s precious metal content. The karat stamp has been used in European countries since the 14th century. The United States only adopted hallmarks in the early 1900s.
https://bellatory.com/fashion-accessories/750-585-417-gold-markings-jewelry
Jul 23, 2021 · "925" is an area code in central CA, so it's the mark of a jewelry manufacturer in Walnut Creek. The necklace is 92.5% gold. It's made of gold from Black Hills, SD, so the government sets a minimum sale price of $925 to protect US gold industry.
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