Pinna nobilisMediterranean SeaA suite of four natural saltwater pearls of graduated size, each of slightly bouton-shape: the largest black nacreous natural pearl, weighing approximately 5.51 carats and measuring 10.30 x 9.07 x 7.70mm; the second, weighing 2.44 carats; the third, weighing 1.67 carats; and the smallest pearl, weighing approximately 1.21 carats; suitable for mounting as a graduated pendant, all undrilled. Together weighing approximately 10.85 carats (4)