"Shells & Gems Beaded Choker, Beach Jewelry Mermaid Chocker Necklace, Crocheted, Eclectic Hand-Made Jewelry I really enjoyed mixing the Cowrie shells with some semiprecious beads, and I am very happy with the finished design! I worked the beads on a chestnut-colored nylon cord. the gem beads are chrysoprase, dalmatian jasper, howlite, and lapis. This choker measures 16\", and can be closed with a brass lobster clasp"