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https://www.georgianjewelry.com/blog/iridium-platinum-explained
Why combine iridium with platinum? It gives platinum an even harder-wearing durability. Usually jewelry and rings are often 10% iridium and 90% platinum. Hallmarks that you may find are 10 Irid 90 Plat, 100 Irid 900 Plat, 10% Irid 90% Plat, or other variations. Just a few examples are shown below.
https://www.antique-jewelry-investor.com/960-mark-antique-gold-ring.html
960 Mark - Antique Gold Ring. by maria. (long island NY) the mark has an "M" inside a double diamond shape with 960 to the right both in an oval, then an additional mark to the left.
https://www.etsy.com/listing/267700139/platinum-jewelry-960-platinum-necklace
Made in Germany: A special necklace to close with a handmade clasp in 750 / - yellow gold. The chain is 41 cm long anchor chain consists of a Platinum. Working in yellow and white gold Moon and stars. 5 citrine are faceted in star-shaped ground. Large star 6 mm. Total weight of the chain: 7.6 g.
https://www.pricescope.com/community/threads/are-there-any-downsides-to-a-900-platinum-100-iridium-mix.158700/
Jan 16, 2013 · Re: Are there any downsides to a 900 Platinum / 100 Iridium My experience with 900 Platinum is that it cracks easier then 950 platinum. Im in the belief that Plat 950 has prevailed over the years as the jewelry standard because the security that it provides.Estimated Reading Time: 5 mins
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
A Makers Mark is the designer, manufacturing firm or representative symbol that is stamped into your precious metal - also called trademarks. This mark provides proof that your jewelry item was made by the designer or jewelry maker and is considered "signed". All marks …
https://community.ebay.com/t5/Archive-Fine-Jewelry-Gems/Antique-Platinum-ring-marked-RD-PLAT-Real-Hallmark/td-p/2955866
Nov 19, 2012 · What you are seeing is "irid" 'plat", thats an older stamp for platinum jewelry,but the full stamp of ''Irid" has probably worn off. It means 90 % platinum, and 10 % Iridum, a low tarnishing metal that platinum is mixed with...nowadays, platinum jewelry is 95% platinum, and 5 % Iridium,and the stamp is usually "PT' for Platinum and 'Irid".Thats a beautiful ring,bids will probably go thru the roof.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Jewelry Maker’s Marks: A Brief History. To be considered an antique, a piece of jewelry must be 100 years or older, while vintage jewelry must be more than 20 years old to be classified as such. “Retro” jewelry refers to pieces made during the 1940s and ‘50s and are characterized by the use of large and colorful gemstones.
https://jewelry.lovetoknow.com/about-jewelry/understanding-markings-jewelry
You may notice the following metal stamps or markings on your jewelry: Marking. What It Means. A number, followed by "k" or "karat". The item is gold. The purity of the gold varies by the karat number, with "24k" being nearly solid gold and "10k" being 10/24 gold. "Gold-filled" or "GF". The piece is mostly made of base metal, but it has a sheet ...
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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