Vintage stone 925 marked sterling silver ring yellow

Very cool vintage sterling marked 925 ring w beautiful ornate detailing around the stone. Think the center is some kind of stone. Has pretty variation throughout. See video for best representation of the stone. Would fit size 7.5-8 best. Tags : vintage , handmade , leather , Anthropologie , boho , free people , indie , bohemian , modern , minimal , independent , minimalist , farm rio , Rachel comey , Ulla Johnson , Y2K , ibiza, loewe, Zara , H&M , other stories , aritzia, topshop , reformation , for love and lemons , child of wild , Pamela love , dannijo , Alexis bittar , vacation , blogger , STAUD , Simon miller , Ganni , coach , Kate spade , Madewell , asos , nanushka, Paloma wool , Sandy Liang , self portrait , Tibi , Jenni kayne, spell and the gypsy, Rebecca Minkoff , Alice and Olivia , sezane , Christy dawn , doen , COS , & Other stories , off white , street style , Simon miller , Isabel marant