Looks very 1920'a vintage to my eye.  Beautiful double strand beaded bracelet is represented well in online picture.

Black beads with square inlay that hold 5 clear crystal stones -- 1 inch double black bead strand then square piece and so on with 5 square pieces altogether.

Fits my medium sized wrist with room to spare.

Very eye catching and looks pretty paired with these heart shaped earrings:

<a data-hook="product-link-linked" class="a-link-normal" href="/Fashion-Costume-Jewelry-Vintage-Style-Marcasite-and-Black-Crystal-Heart-Dangle-Drop-Earrings/dp/B005URI8UC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Fashion Costume Jewelry Vintage Style Marcasite and Black Crystal Heart Dangle Drop Earrings</a>