Maruzome

Round Kiwa. Kiwa that follows the scallop-shape of the scales. Also called Tama Giwa. One of the two primary Kiwa shapes. Often seen in Kohaku of the Dainichi bloodline. It is highly prized because it resembles the shape of a cherry blossom petal. The opposite is Kamisori Giwa.

(Courtesy of the excellent Book Kokugyo Vol II)