Hi Jane, Welcome!
Did you take the photos with macro (flower) on? Most of them are too blurry to really see the characteristics of the pearls. Thank you for showing them on white cloth, that does help. The size seems to be about 7mm? If so, they would not be South Sea pearls. In some of the photos the pearls seem slightly flattened, not perfectly round, but that could be a distortion in the photo.
Please put up some clearer close up photos so we can be of more help.