We are often asked about the value of pearls people inherit.
Some people want to know if they need to insure them (i.e. replacement value.) Usually they don't need to be insured.
Others are hoping to sell the pearls. Resale value is lower than replacement value. (One buys at retail but sells at wholesale.)
Unless the pearls are a famous brand like Mikimoto or belonged to someone famous, their main value will be their sentimental or family value. Small pearls can make a nice gift for a young girl in the family, for example.
Generally speaking, pre-owned pearls do not tend to sell for much. But if that is what you want to do with them, check out SOLD pearl necklaces that are similar to yours on eBay. That should give you an idea of what you may expect them to sell for.