Large iridescent silvery grey blister in the shape of a 33x24 mm drop

This large drop-shaped blister measures 33x24 mm. This blister has a beautiful silvery grey color.

This grey blister shows a lot of orient. This blister pear shape shows the colors of the rainbow. This iridescent shell comes from a culture of black pearls. Photo taken under fluorescent lighting. This item is made of mother of pearl.