Thank you for rotating for me, the drop is not removable. It was bought in 1919 by my Great Grandfather for my Great Grandmother and has been in the family ever since.
Thought I would share this on here as its beautiful, it belongs to my mother. The drop pearl has a grey tinge it has been questioned as to whether it could be a black pearl?
I have this seed pearl rope necklace, it was given to my great grandmother on her wedding day in 1912 and I don't know if it was a new gift or handed down. I also have no idea of the current value.