7 1/2 inch silver plate stone bracelet

Pretty bracelet and nice piece to accent other silver bracelets, necklaces or earrings. This bracelet feels like sterling silver but I can’t find any silver marking on it. I believe the stones are onyx but don’t know for sure. bracelet has a nice solid weight to it which makes me believe is sterling and real stones, but since I can’t verify, I’m pricing as costume jewelry.