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https://www.ukbullion.com/blog/what-is-gold-375-how-to-read-precious-metal-hallmarks/
May 04, 2018 · A guide to gold 375 If your gold is inscribed with the ‘375’ hallmark, it means that it is 37.5 per cent pure, or 9 karat gold for short. The remaining proportion of your product will therefore be an alloy of other metals, usually copper or zinc, which buyers don’t generally have much interest in.
https://goodjewelleryguide.com/jewelry-hallmarks-guide/
Jan 21, 2021 · The first requirement for all jewelry to be found on the market is to have these marks. 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.
https://www.antique-jewelry-investor.com/antique-jewelry-hallmarks.html
For example, 9ct (.375) struck into yellow gold Jewelry which means there is 375 parts of gold out of 1000 parts of metal. The other 625 parts of metal is a mix of copper, silver, and zinc. The second stamp is the 'origin mark' or 'assay office' mark or ‘Mark of Origin’. The origin mark, simply tells you where the item was assayed.
https://www.jewelry-auctioned.com/learn/jewelry-how-tos/how-to-understand-the-meaning-of-gold-hallmarks
9k gold is 37.5% and stamped hallmark 9K or 375. Hallmark stamped k or kt is same. Sometimes there is not much room to leave hallmark so k is more often used. Gold, Beautiful gold we all love the color, the sparkle and design of a nice piece of gold jewelry.
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