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https://community.ebay.com/t5/Archive-Fine-Jewelry-Gems/General-999-silver-questions/td-p/1927480
May 31, 2007 · In the US, a fineness mark must be accompanied by a registered maker's mark. Most artists can't afford to register their marks. So, while it's not unheard of to find silver marked .999; a good percentage of the silver that is .999 may not be marked.Estimated Reading Time: 2 mins
https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Apr 29, 2021 · Another common stamp on gold (especially from England) are essay marks. These marks are not made by the manufacturer but by the essay’s office to certify the purity. Each number stands for the percentage of purity of gold, platinum, and silver. For gold, the stamps are 375, 585, 750, 916, 990 and 999. For silver, the stamps are 800,925,958 and 999Estimated Reading Time: 7 mins
https://bellatory.com/fashion-accessories/750-585-417-gold-markings-jewelry
Jul 23, 2021 · Pure gold is 24 karats and .999 fine. (It's never 100% pure.) So the various fine gold markings, or stamps, tell you the purity of each jewelry item. More karats (the number before the "K") or a higher number means higher gold content.Estimated Reading Time: 6 mins
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Remember that jewelry marked “900 Platinum” is 90 percent pure platinum, or 900 parts pure platinum out of 1,000. Look for any of these other marks to indicate this type of jewelry: “900 Plat,” “Plat 900,” “Pt900” and “900Pt.” Determine whether jewelry is 100 percent pure gold by looking for the “24K” symbol.
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