KASUMI PEARLS ROSE GOLDEN 10-13.5mm KASUMI PEARLS ROSE GOLDEN 10-13.5mm This is an exquisite strand of large graduated 10 to 13.5mm cultured JapaneseKasumi pearls. Japan Kasumi pearls are large freshwater pearls with a shell bead nucleus. They are cultivated in the upstream areas of Lake Kasumi-ga-Ura, some 40 miles northeast of Tokyo. Kasumi-ga-Ura roughly translates to the body of water beyond the mist. Three men remain active in a craft that employed many hundreds during the 1960s and 70s.