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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 · 999 (99.9% silver or 999/1000) As mentioned above, fineness can also be indicated by a word. The two most common words encountered in the United States are “Sterling” and “Coin”. Sterling is, as discussed above, 92.5% silver. “Coin” means that …
https://quickjewelryrepairs.com/articles/jewelry-stamps-what-do-they-really-mean/
Apr 20, 2016 · 900, 900PT, or PT 900 all signify that the metal used is 900 parts per 1,000 pure platinum, while 950, 950PT, and PT950 denote 950 parts per 1,000 are pure platinum. 925 – a piece with this stamp is made of sterling silver.Author: Chris Awad
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. 950 platinum will simply carry 950 in place of the 900 and is 950 parts per 1000 pure platinum. Here is a great article about the above stamps here. What does ALE stamped on …
https://www.answers.com/Q/What_is_900_silver
900 silver is the hallmark that was used on silver mostly before the 19th century mostly in Europe. It has also been denotated for use as coin or standard silver. 900 silver is at least 90% pure...
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.quora.com/What-is-a-platinum-PT900-ring
Sep 11, 2018 · Pure Platinum 999.9 pure is too soft so other metals are added to make it more suitable for making into jewellery. The lowest purity of Platinum is 900 out of a 1000 parts pure. The most common used in the UK is 950 which is 950 pure and 50 parts alloy. There is also 925, see UK hall marks. The hall mark with a 925 stamp is also used for UK silver.
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.
https://uk.answers.yahoo.com/question/index?qid=20081007100702AAroVfg
Oct 07, 2008 · Over thousands of years gold coins have been made to many different standards of purity. By the 19th century, most countries struck gold at either .9166 (22 carat) or .900 …
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. Maker’s Marks
https://www.pricescope.com/community/threads/platinum-pt900-or-pt950-so-whats-the-difference.123749/
Aug 26, 2009 · If the metal used to alloy is Ir, I would prefer the Pt900. 3. HARDNESS AND DURABILITY. In discussions about precious metals people often confuse hardness with strength, but they are not the same. Hardness = HV. Often referred to as "scratch resistance," hardness is measured using the Vickers Hardness scale.
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