The center motif looks like this substantial diamond brooch.
--Previous Message-- : : Goodness! The centre is not part of the : Poltimore, but perhaps the sides are. : : : : : --Previous Message-- : Is the large brooch part of the floral : tiara? : : : As part of some headgear ... I had this : filed with examples of the Poltimore tiara : being worn in parts, although I don't think : that the center section comes from the : Poltimore. : : : : :