This is quite old. It was given to me by my grandmother, who loves jewelry. The pm90 hallmark is a rare hallmark used in the 1950s and 1960s on this platinum ring. It's a natural stone. It's genuine. ♡♡ Natural stone ring, sapphire ring Topaz ring, gemstone, gemstone ring Jewelry, history, rare, platinum ring Platinum, pm90, pt950, PLATINUM Diamond ring, diamond Natural diamond Blue sapphire, blue topaz