I think they are dyed, bead nucleated Chinese cultured freshwater pearls.
The clasp is gold filled. (14K gold layered over base metal.) Gold filled must be 1/20th gold by weight in the USA.
Since you clearly like pearls, you may enjoy taking the "Pearls As One" pearl course offered by the CPAA. You'll learn a great deal about pearls, which will inform any future purchases. I'll DM you a code to take it for free.