A French Belle Époque brooch pendant

A French Belle Époque brooch pendant, the carved black onyx campagna-shaped centre section surmounted with two zig-zag sections millegrain-set with rose-cut diamonds, suspended from a diamond-set triangular upper section centred with a diamond flower head and with a tassle of seed pearls suspended from a line of rose-cut diamonds and lapis lazuli border, the platinum mount marked to the reverse with French control marks, maker's lozenge E.B. and scratched with inventory number 2056, possibly detached from a larger piece of jewellery and with later brooch fitting, 10cm high