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https://www.specialtymetals.com/blog/2016/6/9/how-to-recognize-platinum-when-you-see-it
Jun 09, 2016 · Send It to Us for Testing. If you have a silver-toned item that could be made of platinum, call us at 800-426-2344 and ask us to test it for you. When you do, ask about shipping costs. Your items could qualify for free or discounted shipping when you send them to us.
https://www.leaf.tv/articles/how-to-identify-a-platinum-ring/
Look on the inner shank of the ring for any detailed letters or numbers. If the shank has a visible, "PT" symbol, reads "900 PLAT"or has "950 PLAT" markings, then the ring is definitely platinum. If the ring shows a 9K, 10K, 14K, 18K, 22K, with or without a series of three numbers…
https://www.doverjewelry.com/blog/identify-platinum-silver-jewelry/
Oct 17, 2013 · Platinum, on the other hand, has marks of “PT” or “PLAT”. 2. Compare the weight of the jewels People can identify the type of jewel through weight, the proportion of silver is 10,49, while the platinum is 21,40 which makes silver nearly double lighter than platinum.
https://www.jewelryshoppingguide.com/what-is-platinum/
Some common platinum hallmarks are: 950 Plat or 950 Pt. - The metal is at least 95% pure platinum and 5% alloy metals. 900 – 90% platinum purity and 10% alloy metals. 850 Plat or 850 Pt. – Platinum purity is 85% with the other 15% being other metals. 800 Pt. 200 Pd. – Platinum purity is 80% while ...
https://treasurepursuits.com/how-to-tell-platinum-from-white-gold/
The color of platinum is naturally white. Platinum jewelry contains 90% to 95% of platinum and the remaining 10% to 5% is mixed with an alloy such as iridium or ruthenium. These alloys are generally used to harden the metal. The fineness of platinum is marked with.900 or marked as.950.
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