C1850 Victorian Ring which converts into a bracelet

A gold, enamel and diamond ring/bracelet.
C1850 mid 19th century and later, 
Eight scallop-edged engraved links concertina together to be worn as a ring. Clasp decorated with polychrome enamel and later applied with a diamond-set 'H' in platinum and yellow gold, 
Gold tested as 14-15k
ring size L: US 5.5
bracelet length 17cm: 6 1/2 inches