TWO JEWELLED TWO-COLOUR GOLD-MOUNTED GUILLOCHÉ ENAMEL BROOCHES, ONE WITH ONYX

TWO JEWELLED TWO-COLOUR GOLD-MOUNTED GUILLOCHÉ ENAMEL BROOCHES, ONE WITH ONYX
BOTH POSSIBLY BY FABERGÉ, ST PETERSBURG, CIRCA 1900
Both circular, one enamelled in white over sunburst guilloché ground, centring a diamond-set Imperial double-headed eagle, within a green gold laurel border set with sapphires, with later pin, marked on pin and loop; the other, with onyx body, within a green gold laurel border, centring an old-cut diamond, all within an outer border guilloché enamelled in translucent oyster white, with later pin, marked on pin
1 in. (2.7 cm.) diameter and smaller