Vintage stone quartz crystal 925 marked sterling silver ring clear statement

Very cool vintage sterling marked 925 ring. Think the center is some kind of stone. Has pretty variation throughout. See video for best representation of the stone. Would fit size 5.5-6 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