RARE MATCHED NATURAL BLACK COLOR CULTURED PEARL CHOKER WITH DIAMOND CLASP. 39 pearls of 10.00 to 10.90 mm. Ball clasp with pave-set, brilliant cut round diamonds. L: 17 1/2" Accompanied by GIA certificate no. 4252439, and purchase receipt from C.G. Sloan & Co., 11/93, Sale no. 840, lot #51 Estimate $15,000-20,000