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https://www.jewelryshoppingguide.com/palladium-rings-guide/
This fact upgraded palladium to a precious metal and increased its value in jewelry. The recognized palladium hallmarks are 500, 950 and 999, which denotes the purity levels of the metal. A piece of palladium jewelry marked 500, for example, simply means that …
https://www.thoughtco.com/metal-jewelry-stamps-and-marks-608017
Feb 12, 2020 · The quality marks for palladium are applied to articles composed of at least 95% palladium, or 90% palladium and 5% platinum, iridium, ruthenium, rhodium, osmium or gold. View Article Sources "Guides for the Jewelry, Precious Metals, and Pewter Industries."
https://www.ganoksin.com/article/950-palladium-bench-guide/
The common alloy ingredient used in China, where palladium jewelry is mass produced is 950 parts palladium and the balance copper. Solder. Palladium or platinum solder is used for soldering 950 palladium alloys. Palladium solder is usually supplied in ‘hard’, ‘medium’ and ‘easy’. The general flow temperatures for them are: Hard ...
http://www.mainline-gold.com/page2.php
Palladium: There is no actual hallmarking laws regarding palladium in the U.S. at present, but jewelers will mark palladium jewelry in much the same way as platinum, except using the marks pall or Pd instead of plat or Pt.
https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
Ten-karat gold is marked 10k, 16, 417, or 10KP; 14-karat gold is marked 583, 585, or 14KP; 18-karat gold is marked 750 or 18KP; 22-karat gold is marked 916 or 917; and pure gold, 24 karat, is marked 999. Marked platinum will say 900 Plat, Plat 900, Pt900, or 900Pt. Modern palladium is usually marked Pd950. If you can't find a mark, you'll have to test the piece.
https://www.hooverandstrong.com/metal-information
A hallmark is a marking on a piece of jewelry that guarantees a minimum percentage of gold, silver, platinum or palladium present in the item. When looking at your jewelry, if it is a gold, silver, platinum or palladium alloy then a hallmark will always be present, usually somewhere where it will not be …
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