This is a vintage white heishi shell necklace featuring a two-piece brass barrel screw clasp.

The uniform disc shape of the smooth, sliced pieces is characteristic of heishi beads, which are traditionally crafted from natural clamshells or puka shells to achieve a flat, stacked alignment. This style gained widespread popularity during the 1970s and 1980s beach culture eras.

The estimated market value for a vintage white heishi or puka shell necklace generally ranges from $15 to $75 USD for common, standard-sized vintage pieces on platforms like eBay and Etsy