Tahiti Napkin Ring in Natural Set of 4 by Kim Seybert. Tahiti. French Polynesiaصs largest and most diverse island. is known for its tranquil ocean waters and host of serene lagoons. The Tahiti Napkin ring. reminiscent of the Tahitian Gardenia and fashioned from river shells creates an exotic look. Materials: 50% Fresh River Shell. 45% Acrylic Base. 5% Metal