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As requested, attached is the Carbon Dating results from the University of Arizona. The letter states that the pearls are from between 1455 AD and 1615 AD.

After eleven natural saltwater pearls were sent to the GIA, they published this article in the magazine GEMS & GEMOLOGY in October 2017. https://www.gia.edu/gems-gemology/fall-2017-saltwater-pearls-columbian-era

Above are some sample images of natural saltwater pearls certified by the GIA and radio carbon tested by the University of Arizona.

Caitlin, the pearls were sent to the GIA and from there for carbon testing to the University of Arizona. I also consulted with some experts and these are the results. They are Atlantic Oyster pearls, Pinctada Imbricada and Atlantic Winged Oysters Piteria colymbus, the GIA found them to be in...

Imported Group Gallery - Antique Natural Saltwater Pearls

Please join me if you have any story, picture or knowledge of antique, rare, natural saltwater pearls.

Thanks Caitlin, I will follow your advice and do some more research. I will keep you posted.