Vintage Gold Gemstone Ring

This is a beautiful vintage solid 10K yellow gold ring. I forget what the Jeweler said the center Stone was when he tested the gold and gemstones. He did mention that the ring is pre 1970s He also suggested that i sell between $400-500. I'm selling it for less because I would love for it to find a new home with somebody who really enjoys it and would wear it rather than it sitting in my storage facility for another 20+ years. The ring is in very good condition. I received it in the 90s from a late relative and have basically had it packed away in my storage facility ever since. It's a size 7 but can easily be sized or fitted by a jeweler. It's marked 10K and has a cursive letter P. Feel free to ask any questions. Thanks