Hawaiian Surfer Style Genuine Natural White Puka Shell 18" Choker Necklace- (Small Shells) Puka Shell Necklace, great gift item for a teen, man or woman. Also very popular among the surfers. 18" choker with small shells ( approx. 1/4" across) all natural, various shapes, sizes of genuine puka shells Twist barrel heavy duty clasp. Designed in Honolulu and hand strung in the Phillipines. Real shells are imperfect & these are real shells.