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https://blog.goldiesjewelry.com/understanding-gold-grades-and-other-precious-metals/
Sep 03, 2019 · Unlike diamond grades, gold grading is not done to measure weight. Instead, gold grading systems are used to measure the amount of pure gold that is present in each piece. Essentially, the ratings tell retailers and consumers how “pure” the gold is in jewelry items. Gold Purity. You’ve likely noticed various embossed codes on your jewelry …Estimated Reading Time: 3 mins
https://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
Feb 20, 2013 · A lot of jewelry will have several stamps or marks. Often there is one stamp to indicate the purity of the gold (“14K”, as mentioned above). The purity mark can be accompanied by a second mark called a maker’s mark or a jeweller’s stamp. These are custom stamps or engravings placed in jewelry by whomever manufactured it.
https://style.visualstories.com/how-to-identify-gold-jewelry-markings
If it's a piece of European jewelry, the purity grading will be a three digit number less than 1000, with 999 being the millesimal fineness grading which is equivalent to 24 karat gold. The value may be anywhere between a minimum of 333 and a maximum of 999. Divide the value by 10 to get the percentage fraction by weight that's pure gold.
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