18K-WG BLACK OPAL AND DIAMOND PENDANT WITH ONE PEAR SHAPED CAB BLACK OPAL= 4.50 CT. WITH 19 RBC DIA.= 0.80 CT., I-J / VS-1. WITH 18K-WG BLACK ONYX AND OPEN LINK CHAIN NECKLACE MEASURING 16 INCHES LONG. TW= 8.2 GRAMS, CIRCA 1950S.