PLAT stamp means 95% platinum?

[Gleam]

And does it also mean the other 5% is ruthenium?

I did do a search but I only came up with a response that was attributed to e-weddingrings.com which I'm not sure is accurate: "All e-Wedding Bands platinum bands are 95% pure platinum and 5% ruthenium. This particular platinum/ruthenium alloy combination -- generally referred to as PLAT or PT950 -- is the highest purity available in platinum bands."

My engagement ring is stamped PLAT, and I was curious if from this stamp I could tell whether it's ruthenium or iridium.

Thanks to all the experts again!!

Edited to add: Just to be clear, my ring is NOT from e-weddingrings.com... or else I'd have the answer to my question!

 

[stone-cold11]

No necessary, depend on who you buy it from. There are many different Pt alloys, all can be stamp PLAt or Pt950 as long as the % mass in the alloy mix is 95% Pt.

 

[Gleam]

Thank you, Stone-Cold!