Pura Vida Puka Shell Choker. Nothing says classic coastal style like our Puka Shell Choker. With a strand of all-natural, raw puka shell beads, this made-to-layer design features silver spacer beads spread throughout to elevate the look and add a little shine. Brass base with rhodium plating & natural raw puka shells. Chain: 15" with 3" extention. Natural raw puka shells: 4mm diameter. Rhodium plated brass spacer beads: 4mm diameter. Because jewelry products are handcrafted by artisans, dimensions may vary from piece to piece. Imported. California Residents: WARNING PROP 65: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.