I have a 30 inch strand of pearls that my father bought my mother in 1983. He paid $1250 for them at Cain-Sloan, a very nice department store in Nashville, Tennessee. I have the certificate that says they are 7mm. On the clasp is says 14K. How much are they worth today? I would like to shorten them to about 18 inches and perhaps make a bracelet out of the rest. Anything else you can tell me I would appreciate.