My new ring

Last weekend my mom, sister and I went to the DeAnza flea market. I was hoping to find some furniture that I could use but there weren't many vendors there due to the rain. I did find this ring at an antique and vintage jewelry stand. Since that other finger is bare it's nice to have a little something on my hand sometimes. I have no idea what the stone is. My guess is glass or some kind of manmade material. It's cute.