Antique c1860-1880 Old Cut Diamond Rivière Necklace 17inch length 13.5cts

C1860-1880
Antique Old cut Diamond Rivière Necklace
17inches 43cm original length 
Clasp with safety catches
13.5cts natural old cut diamonds H-I colour
Central stone 0.6cts G-H colour
Silver set cut down collets
15ct Gold connectors
Diamonds set in Silver & 15ct Gold tested via XRF 
15ct Gold open backed 
23.5g
Retractable hanging loop on central stone to hang pendants 
Independent certificate included