Nice find, That is a bottle necklace....look at the back and see if they have any hallmark from the manufacture...If it from England you will see a profile of King George (hence Georgian Silver)
I recently found one of these in an antique shop and after careful research of the hallmarks on the back I discovered the item was of Royal descent...I put it on EBay and got $600.00 for it and I only paid 45.00
if there are markings take a pic and post it and I can use my books to let you know what ya got...
well done...