Well, I doubt the pearls are quite as large as in the photo. Can you give us the sizes, please, and the type of pearl; it is good for our education! Thank you very much for taking time to share your photos!
for the black I do not remember the dimensions, but it is a Atrina.
for white: tridacna, 13.4 x 17.1, of course there exist much bigger. I will continue to share more pictures.