Akoya pearls, paired with a gold clasp, are an absolute jewelry classic, embodying traditional Japanese quality. Akoya pearls are cultivated in Pinctada fucata (Akoya oyster) shells, primarily in Japan. This type of pearl was the first to be successfully cultured in the world, thanks to Kokichi Mikimoto. Below is a detailed analysis of the characteristics, value, and features of your necklace. Key Features and Value of Akoya Pearls: Mirror Luster (Lustre): Saltwater Akoya pearls are prized above freshwater pearls due to their incredibly deep, bright, almost metallic luster. It perfectly reflects light, making the beads appear to glow from within. Perfect Roundness: Of all pearl types, Akoya pearls have the highest percentage of perfectly round beads. This is because a round mother-of-pearl bead is implanted inside the oyster, which the shell then carefully coats with thin layers of natural mother-of-pearl. Assembly technique: The thread is assembled "through a knot." This is an important marker of premium jewelry. Knots prevent the beads from rubbing against each other and damaging the mother-of-pearl, and if the thread breaks, you won't lose all the pearls. Clasp (Filigree Box): A gold box clasp decorated with a central pearl is an iconic design of the mid-20th century (c. 1950-1980). Japanese export pearls of that period were most often equipped with clasps made of 14-karat gold (585 fineness).