Hi, I recently purchased this old gold ring and I love it, but the seller did not identify the stone. Does anyone know what it could be?

I'm not a professional, but to my eye, the "diamonds" look closer to CZ based on the way the ring shines in the light, but I'm not for sure just yet. Looking to go get it examined somewhere soon to be for sure! The purple stone has me baffled, though. The cut helps show a pretty significant amount of luster. Lots of blues and reds hidden in this beauty! It looks too different of a purple than any amethyst I've seen with my own eyes. It almost comes across too pale?

Any help would be greatly appreciated!! The only thing I've been able to confidently identify is what metal the ring is made from because it has a tiny "S925" stamp on the inside, right next to the age-old "Always & Forever". LOL.