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https://hunterridgeacquisitions.wordpress.com/2014/06/27/the-difference-between-silver-sterling-silver-900-silver-800-silver-alpaca-nickel-silver-and-silver-plated-jewelry/
Jun 27, 2014 · A fineness mark is a mark put on a piece of jewelry to indicate the percentage of pure silver it contains. There are two common types of fineness marks for silver – word marks and numerical marks. The numerical marks usually represent the number of parts of pure silver out of 1000 contained in a piece of silver.Estimated Reading Time: 9 mins
https://www.etsy.com/market/900_jewelry
Vintage marked 900 ? silver marcasite & amethyst ring size 7 XLHDesignsArt 5 out of 5 stars (695) $ 30.00. Add to Favorites ... Vintage .900 silver coin jewelry - Winged Liberty LuckyButtonsJewelry 5 out of 5 stars (153) $ 33.00. Add to Favorites USA Mercury Dime Pendant, cut coin jewelry, with letters, .900 silver, Valentine jewelry gift ...
https://www.silverrecyclers.com/blog/900-silver.aspx
The number 900 refers to its level of purity, and it means that that your silver item is 90% silver and 10% alloy. This number system is an easy way to tell an item's purity. Another example is 800 silver which is equal to 80% silver. Most US coins minted before 1965 were 90% silver and 10% copper.
https://www.drloriv.com/antique-tips/silver-jewelry-marks-and-more/
Silver marks: 800, 900, Coin or Britannia. Some silver pieces of jewelry are marked 800 or 900. Of course, because these pieces are not sterling silver because they are not 92.5 percent pure silver. Silver pieces like necklaces or rings marked 800 have 80 percent pure silver content.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Plat" or "Pt" if a number is used in front of the term to disclose the amount of pure platinum in the mix, such as : "850 Plat" or "850 Pt", or
https://www.etsy.com/market/900_silver_bracelet
Industrial / Modernist 900 Silver Heavy Round Link Bracelet 7 Inches. 1950s Signed A. Belgiorno. Argentina. 41 Grams.
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