Vintage Solid Onyx? Bangle

One piece bangle I think it's made out of onyx or something similar. Heavy and cold to touch initially... which makes me think stone. Lovely marble/banding pattern on this unique piece. New to Poshmark? Sign up now with my code:crazycatlady332 and you will receive a $15 credit to spend on your first purchase (I also get the same credit)!