The Bodhi Tree was a large sacred fig tree under which Buddha sat and achieved enlightenment. (Incidentally, the term 'bodhi' also means enlightenment.)
The 'leaves' hang from twisted tubular herringbone ropes, separated by brass spacers
The St Petersburg 'leaves' are tipped with wooden rondelles
Detail of the St Petersburg 'leaves'
Detail of the clasp with a small St Petersburg 'leaf' and a brass Buddha charm