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Reverse
Detail

SUPERB ART NOUVEAU DIADEM
Mucha style Byzantine Princess
Gold Opal Diamond
H: 4.2 cm (1.65 in)  W: 10.6 cm (4.17 in) 
Marks: Crab mark
French, c.1900
Fitted Case
The diadem can also be worn as a pendant by unscrewing the reverse
Unfortunately unmarked possibly by Fouquet or Vever
Reserved

Ref: 7204