14k yellow gold clasp Pearl 6.5mm round 6.75" long this is a vintage natural pearls. I have them restatraintian once. I know they are many cultures pearls that may come close to the antique natural ones. unfortunately I am not a geologist. I just have a passion for jewelry. I have those for quite a long time and I have to said that they are beautiful and unique! I am positive that they are natural and uncultured; but unfortunately I am not a geologist so that is why the price!! which natural pearls goes for thousands of dollars!! *Beautiful luster