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https://www.silverrecyclers.com/blog/999-fine-silver.aspx
999 fine silver is essentially pure silver- no alloys have been added. There is a tiny amount of impurities that prevent it from being 100% pure silver. It's considered to be investment grade and many investors only buy fine silver bullion bars and coins.
https://www.quora.com/What-does-the-999-mark-mean-on-Chinese-gold-jewelry
Dec 11, 2019 · It means that it is (999/1000) “pure” gold. In coins, this is the standard. However, in jewelry, this would never to used because pure gold is too soft (malleable) and would break apart too easily to be worn. And beware, much of “Chinese” 999 gold is counterfeit!
https://www.quora.com/What-does-s999-sterling-silver-mean
The number of 925 or 999 stands for percentage of composition. Silver 925 means at least 92.5% in this material is silver, and silver 999 means that at least 99.9% in the material are silver. And why we said silver 999 is pure is because it is difficult and unworthy to purify 99.9% silver into 100% as for a jewelry.
https://oureverydaylife.com/what-are-the-differences-among-24k-22k-999-gold-12497750.html
Sep 28, 2017 · Because 24K, 22K and .999 gold contain such high quantities of pure gold, they are too soft to be used in jewelry. They are often combined with other metals to create an alloy for jewelry making. Generally, the purer the gold, the lower the amount of other metals found in the alloy. So only 24K and .999 gold jewelry can legally be called "pure gold."
https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Jul 19, 2018 · So what does a 900 Platinum, 900 plat, plat 900, pt900 and 900pt stamp mean? 90% platinum or 900 parts per 100. Usually mixed with other platinum metal group alloys such as Ruthenium, rhodium, or palladium.
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Remember that this jewelry may also be marked with “999” symbol. Identify 22-karat gold by the “22K” mark, which indicates that jewelry is 91.6 percent pure gold, or 22 parts pure gold out of 24. Note that 22-karat gold jewelry can also be stamped with “916” or “917.”.
https://www.leaf.tv/articles/how-to-identify-gold-jewelry-by-number-marks/
Gold can be all the way up to 24k, 999 or 9999, which indicates about 99 percent pure gold. There are about a dozen numbers in between, from 10k or 417 to 23k or 950. Look for other hallmarks or stamps that indicate plated gold, such as "HGE," "Gold Filled," "Plate," "RGP," "EP," or "1/10."
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