by LindaFletcher » Jul 17, 2019 Hi everyone, long time lurker here! I was hoping someone on the board could help with their expertise. I bought a vintage enameled 14k gold ring with what was sold to be a peridot but i have my doubts, i actually doubted it before i bought it but i was fascinated with the ring and the big green stone in particular. I first thought maybe it was a uranium/vasoline glass stone but it doesn't test as glass on my presidium tester and it doesn't test as spinel either, and synthetic spinel was my second guess? It does have various inclusions (some brown) that you see with the loupe. It also has lots of color dimension within the stone, the middle of it is a yellowish color, then the minty green but it also changes color with every different light source and becomes completely colorless at night. It's also very shiny and brilliant with lots and lots of color flash, and in the sunlight it looks like a crazy neon toxic green color, kind of like a Hyalite Opal? Anyone have any idea what this stone is? Can something this neon only be man made? Your help is very much appreciated!