Natural Pearl Necklace with Diamond Clasp. Photo courtesy Doyle New York.

Composed of 83 pearls approximately 8.25 to 4.50 mm., completed by a silver clasp set with one old European-cut diamond approximately 1.00 ct. Length 17 1/2 inches. Estimate $50,000-70,000 

With SSEF report no. 61172 stating that the pearls are natural, saltwater. 

Doyle New York. Important Jewelry. Wednesday, September 25, 2013 at 10am - http://www.doylenewyork.com