A late 19th century opal, diamond and enamel brooch, by Carlo Giuliano

A late 19th century opal, diamond and enamel brooch, by Carlo Giuliano
The central old brilliant-cut diamond and opal cluster between blue and white piqué enamel triple lines with blue and white enamel lozenge shaped terminals, each with old brilliant-cut diamond accent, circa 1890, 4.0cm long
Maker's mark C G