Pendant portion is domed on each side, with a different pattern of Abalone on each side. It is designed to pivot around allowing it to be worn either side up. The Chain is abalone inset curving segments. High quality. Masterfully crafted. Wears at 16.5 inches. The pendant is 2 inches. Marked Sterling Mexico and what looks like REL. Ca., 1960. A substantial and beautiful piece.