Vintage breclet and necklace set

⚠️🚨EDIT: I am helping my grandma sell this. She informed me it is silver, however now she is uncertain as I was not able to find a stamp. PRICE VERY NEGOTIABLE BECAUSE OF THIS🚨⚠️Silver & black onyx. I believe it is from the 60s but I cannot promise that's the correct year. It is definitely vintage. Very minor signs of wear, mostly on the underside where it is not visible anyways. The braclet has a tighter clasp and needs to be pulled open before putting on your wrist. Choker necklace opens wide.