Silver foil enameling on copper with a striated silvery white body with a dark silver grey modernist graphic.
Marks: del campo, ITALY (etched marks)
For more information on Ponti and Del Campo see: Gio Ponti, ed. Ugo La Pietra (Rizzoli International Publications: New York, 1996); Gio Ponti: the complete work 1923-1978, Lisa Licitra Ponti (Cambridge, MA: The MIT Press, 1990)
Franz Delavilla / Oskar Dietrich brooch, Handwrought gold with heart-shaped leaves, moonstones, marked: OD makers touchmark, Austrian horse mark (585 / 14k gold standard), c.1911 (matching earrings)