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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 …
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.tentwothree.com/platinum_jewelry_information.asp
PLATINUM ESTATE JEWELRY HALLMARKS 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.etsy.com/listing/624533615/antique-900-platinum-100-iridium-ladys
The watch shown has a casing made of 90% pure Platinum and 10% Pure Iridium. The watch is estimated to be near over 90 years old by my watch maker. He feels between 1920 & 1930. He said the watch is still in running timekeeping condition. It may require a cleaning and lubrication which can be
https://orchid.ganoksin.com/t/platinum-ring-stamped-iridplat/28373
The platinum alloy of choice for a long time in the U.S. was Platinum 900/100 Iridium, an alloy containing 900 ppt platinum and 100 ppt Iridium. This alloy was stamped IRIDPLAT. When the platinum stamping regulations were revised, this alloy was then stamped 900Pt or 900PLAT or Pt 900. There is still a large amount of jewelry beingEstimated Reading Time: 2 mins
https://www.starcojewellers.com.au/v-jewelry/vintage-platinum-jewelry-marks.html
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. PT850 - platinum at 85% . Pt also the chemical symbol - mark for platinum. PLATINUM ...
http://www.mwmjewelry.com/platinum_purity.htm
4) 90% platinum (900) - alloyed with 10% iridium "Classic Platinum" - Vickers hardness = 110. Again: Iridium has an atomic weight of 192.217 - pretty close to that of platinum. 10% iridium, by volume, is a touch over the volume of ruthenium required to equal 5% of our platinum.
https://www.hcrosscompany.com/precious-metals-and-alloys/platinum-iridium/
Platinum-Iridium is generally available as wire spooled onto spools or random length piece rod, strip, ribbon, foil or sheet. H. Cross Company can provide this material in wire sizes from .005″ diameter up to .100″ diameter, strips and ribbons from .0005″ thick to .020″ thick and from .020″ to .100″ wide and in sheet or foil form ...
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.
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