GIOACCHINO BARBERI - 1850S ITALIAN PEASANT MICROMOSAIC BROOCH Oval onyx brooch with a woman in polychrome costume in the centre. Mounted in 18K yellow gold. Signed on the back G.Barberi, Piazza di Spagnia. Gross weight: 31.21 g. Size: 5 x 4.3 cm. An onyx, micromosaic and 18K yellow gold brooch by Gioacchino Barberi, circa 1850. Signed G. Barberi, Piazza di Spagnia. Gross weight : 31,21 gr. Dimensions : 5 x 4,3 cm.