These are exquisite Triple Strand of Akoya Pearls approximately 16", 17", 18" , 5.5mm-9.5mm approximately, you might find one a hair smaller, we do the best we can to measure them as close as possible.  They are a nice quality, the clasp is solid 14K W.G. Filigree.  This is a Beautiful addition to any collection.  This lovely pearl necklace has a retail value of $1500 if purchased in your local jewelry store.