How Much Is One Pearl Worth How Much Would This Pearl Necklace Be Worth?

How much would this pearl necklace be worth? - how much is one pearl worth

I bought a necklace of pearls in the 1950s in Japan. I understand that a chain was very nice, but I know nothing about them. Yes, they are genuine. I want to sell. Who knows how much would be worth? I do not want to be fooled.