The seller is a pawn shop in Chicago. There is nothing on their website that suggests any credentials such as being GIA trained or certified. And based on his inventory pearls are not an area of focus. The listing focuses on the diamonds in the clasp as a selling point.
Pawn shops know nothing about pearls. So that’s a good thing for you. Because if they had something such as a natural pearl necklace from Tiffany with a diamond clasp they would have gotten it appraised but they have minimal knowledge on gemstones in general. (Speaking from past experience as a pawn broker, myself)
At first glance they looked like freshwater pearls, but the diamonds on that clasp highly suggest otherwise. It is very easy to string a strand of pearls with any given clasp. I never did handle many “natural” pearls but if you can look inside of the drill hole some how or get them a picture to look at the pearl from drill hole perspective you may get a hit….
But hey that blemish screams freshwater pearls, to me….
PS: find out how long it has been in inventory for, pawn shops are known for there price haggling and you would very likely be able to get it much cheaper especially if you asked. (Oops now I’m exposing pawn world “secrets”…haha) I would not buy these based on the information gathered in hopes that they were natural due to my own failures with finding natural pearls, and also mistaking cultured pearls as genuine. But alas if this is a purchase you want to make, you have to be willing to take your own chances..
I could probably buy that clasp somewhere for a couple to several hundred dollars and slap a $50 pearl strand on it and look at my market for a deceptive trick Ofcourse. If that was my game, which it by no means is, but if it were I could do that in my sleep.
I was thinking on this a minute and like I said earlier on in this message, pawn shops have minimal knowledge and can work in your favor as previous mentioned but however they can also be very easily duped. Which is my guess, that they themselves were fooled. I’m no expert on natural pearls but if I see that blemish on a pearl that is how I (would be a very good indicator) that I had freshwater pearls on my hand.