Platinum Hallmarks on Jewelry: What Do These Stamps and Markings Mean?
Platinum hallmarks are official stamps certifying the purity and authenticity of platinum items and indicating exactly how much platinum an item contains. The most common marks are Pt950 (95% pure), Pt900 (90%), Pt850 (85%), and Pt999 (99.9%, used for investment bullion). These hallmarks are regulated by authorities such as the FTC in the US and … Read more