A 19th century Austrian gem-set pendant, the yellow-green agate carved to depict a lion mask, with rose-cut diamond eyes and a collet-set pink gemstone stud between its teeth, the gold mount formed as a coiled serpent with garnet eyes, closed-back setting, Austrian assay marks, maker’s mark ‘H.I’ possibly for Heinrich Infeld, pendant length including bale 30mm. £200-£300