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
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...