I would appreciate some help with identifying this pearl necklace. The clasp is 18K gold but it marked oddly, reading K18. The pearls are real, with an oblong shape and have turquoise beads in between them. They seem, at least to me, to be of good quality, but I am not sure. Also, because they have an 18K gold clasp I am assuming that the quality is good, but am aware of what is said about the word assume. Thanks for any help.