(Lot of 2) Cultured pearl and yellow gold jewelry Including 1) Crevoshay convertible pendant-enhancer-necklace, composed of (31) 13 X 6.8 mm, cultured pearl coins, completed by a cultured pearl coin, removable, 18k yellow gold pendant-enhancer, marked Crevoshay, 18k, forming an 18 inch necklace; tog