This is a Akoya Cultured Pearls W.G. Diamond Clasp Double Strand Bead Necklace VTG 16-1/2"Long, It has got white gold clasp with 6 diamonds 2mm each, its a double strand necklace, we are not sure if its white gold or platinum clasp,  each pearl bead is 7mm, is in very nice condition and would make a lovely gift. very gorgeous and pretty necklace, please see pictures. 
chris