We guarantee this is an authentic MIKIMOTO 18K Yellow Gold Akoya Pearl 5-5.5mm Strand Necklace or 100% of your money back. This is a classic strand of stunning cultured pearls from Mikimoto's "M" Collection These are 5-5.5mm pearls finished with a lovely clasp is 18 karat yellow gold. This is an elegant piece of fine jewelry with the luxury and style of Mikimoto! **Please note that this necklace has been restrung, and that the clasp it is an original Mikimoto just not original to this piece**