Georgian Emerald Green Paste Rivière set in 9ct Gold

Georgian Emerald Green paste Rivière 
34 graduated green foil backed stones, in closed-back collets, 
Set in 9 ct, Gold
largest stones 8.7 x 7.42mm, 
Original concealed clasp, 
37.8cm in length: 15inches approx
Please note a very small amount of historic solder is slightly visible on one of the collets (see last photo) 
Otherwise the Rivière is in good antique Order