Posted 5 months ago
isamc
(1 item)
What is the mark 925 PT? How much would it be worth? This is a necklace I received from my aunt. Thank you
PT 925 NECKLACE | ||
| Solved mystery items25 of 11848 |  |  |
PT 925 NECKLACE | ||
| Solved mystery items25 of 11848 | | |
Posted 5 months ago
isamc
(1 item)
What is the mark 925 PT? How much would it be worth? This is a necklace I received from my aunt. Thank you
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Hi, isamc. :-)
*snip*
Federal Trade Commission (FTC) Guides and the International Stamping Act restrict the use of the unqualified word “Platinum” (or “PT”, “PLAT.”) to describe platinum alloys that contain 850 parts per thousand (ppt), or more, of pure platinum. Any platinum alloy containing at least 950 parts per thousand (ppt) of platinum can be stamped “Platinum,” or “PLAT,” “ PT.” For alloys of platinum between 850 and 950 ppt, “Platinum” must be accompanied by the purity. For instance 90% Platinum-10% Iridium must be stamped “Platinum 900”.
*snip*
https://browngoldsmiths.com/top-4-facts-about-platinum/
*snip*
Platinum is usually 90% to 95% platinum and 10% to 50% iridium alloy.
*snip*
https://braunschweiger.com/blogs/jewelry-academy/what-do-those-markings-on-my-jewelry-mean
Valuation isn't done here in the Collectors Weekly Show & Tell forum.