Two gold and micromosaic brooches, last quarter 19th century

The first decorated with an oval micromosaic of a female supplicant offering water to Zeus in the form of an eagle, the gold frame decorated with filigree and granulation, the reverse with a glazed compartment; the second decorated with a circular portrait of a woman wearing a turban in the style of Domenichino, within a gold openwork frame of scroll motif, decorated with granulation, filigree and a pair of grape clusters. 

Frames test as 18 karat gold. The first brooch (sitting woman) has a pendant loop at the top, the frame is dented, micromosaic in good condition, backed with red fabric beneath glazed compartment. The second (woman with folded hands) has a bent pin, tiny spots of matrix missing, with Italian assay mark for 18K gold. Some tarnishing to both pieces, but in good condition overall.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.