The best Akoya produced today in one word? HANADAMA. Hanadama means "round flower" in Japanese. This necklace comes with a certificate from the Pearl Science Laboratory of Japan. This laboratory is the only one that delivers the Hanadama certification.This necklace is made of the absolute best Japanese Akoya (saltwater) pearls. Period.8 to 8.5mm pearls, 18" long. Solid 14kt gold clasp.