Sallyf,
Welcome, what a nice gift! Those are cultured freshwater pearls from China. They appear to have a nice luster in the close up photo, and an off round shape that indicates the pearl formed over a piece of donor tissue instead of a bead. So each pearl is pretty much all nacre. The value would be less than $100, even if the strand has a 14k gold clasp.
Wear and enjoy! Avoid chemicals and hair spray. There is a thread on pearl care if you'd like more information.