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https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
You can test gold, platinum, and palladium jewelry to determine if an unmarked piece you've acquired is genuine. There are easy ways to test jewelry yourself and thus eliminate the need for a professional appraisal. By using chemical agents, namely …
https://www.georgianjewelry.com/jewelry/category/platinum
Antique Russian Demantoid Garnet Bird Brooch. $11,500 USD. Marked Down! $8,950 USD.
https://www.myjewelrysource.com/platinum_jewelry.htm
Platinum Jewelry: Platinum is pure, rare, eternal and versatile. Platinum is a natural white metal and because it is generally 95% pure (18 karat gold is 75% pure), platinum jewelry does not fade or tarnish and will keep its look for a lifetime. Platinum's purity makes …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
The platinum group of metals (PGM) are platinum, iridium, palladium, ruthenium, rhodium and osmium. The major platinum jewelry maker and consumer markets today are China, Japan and the United States. Platinum rings and ornaments date more than 2,000 years, and the culture of platinum ring-making over the centuries has led to various traditions ...
https://www.etsy.com/market/unmarked_jewelry
Vintage Pin Brooch Gold with Pastel Stones Costume Jewelry Unmarked 1.5” OvertheMonVINTAGE 5 out of 5 stars (49) $ 6.00. Add to Favorites Vintage Unique Design Unmarked Silver Turquoise Ring Snicklefritzmadison 5 out of 5 stars (76) $ 19.99. Add to Favorites ...
https://www.tentwothree.com/platinum_jewelry_information.asp
Many estate jewelry hallmarks will be PT900, indicating that the metal is 900 parts per 1000 of pure platinum. The remaining 100 part are usually made with iridium which makes the jewelry harder. 900 Plat - 100Irid - means platinum alloyed with 10% iridium.
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · If for instance, jewelry contains 50% platinum and 50% gold, that piece can not contain a hallmark indicating the piece contains platinum. Also, you must include the alloy present in the mix if the piece contains less than 85% pure platinum.
https://oureverydaylife.com/how-to-identify-unmarked-jewelry-12613171.html
Sep 28, 2017 · Tracking down the authenticity of unmarked jewelry can prove to be a painstaking process, but there are tools and sources that can be used to positively identify almost any designer's handiwork. These mysteries are sometimes solved quickly as the works of impostors, but those who dig deeper with a true eye for the subtleties of unmarked jewelry ...
https://www.specialtymetals.com/blog/2016/6/9/how-to-recognize-platinum-when-you-see-it
Jun 09, 2016 · Not so. Platinum might be a “modern” metal, but has been used to make jewelry – and cigarette cases and other items – for many years. Not Sure What You Have? Send It to Us for Testing. If you have a silver-toned item that could be made of platinum, …
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