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https://jewelryappraisalservices.com/helpful-jewelry-information-about-platinum.html
In the U.S., platinum jewelry usually contains 90% or 95% pure platinum. If a piece of platinum jewelry is marked "iridplat," then it generally contains 90% platinum and 10% iridium, a platinum group metal. If it is marked "plat," then it is at least 95% platinum and another platinum group metal, most likely ruthenium. Owning a piece of platinum jewelry …
https://jewelrydesigns.com/faq/
Platinum has traded well above the cost of gold for decades. The platinum used to create jewelry is 95% pure, whereas gold is typically 58.5% (14kt), to 75% (18kt) pure in jewelry. The white color of platinum is the perfect color to accentuate diamonds. Fine colorless diamonds exhibit the best color when they are presented in white prongs, and platinum is the dominant white metal in jewelry making. The durability of platinum …
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
600 Pt. 350 Ir. = 60% pure platinum, 35% iridium; Platinum jewelry with 15% to 50% base metals also may be labeled "platinum.” These platinum/base metal alloys contain from 50 to 85% pure platinum, but the total of pure platinum and other platinum group metals is less than 95%. Labels for this jewelry …
https://preciousplatinumindia.mobi/faq
How do I know if a piece of jewellery is really platinum? Every piece of platinum jewellery, however small, carries the 'Pt 950' mark. It is your symbol of authenticity and signifies 95% purity (950 parts out …
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