18k yellow gold and 925 thousandths silver brooch, featuring a medallion painted on porcelain depicting "Time saving truth from lies and envy", after a 1737 painting by François Lemoyne (some chips and scratches), set with seventy-eight rose-cut diamonds, secure clasp. Old 18th-century watch back mounted as a brooch. Estimated total diamond weight: 0.50 ct Diameter: 4.8 cm Gross weight: 25.7 g Note: this painting by François Lemoyne is in the Wallace Collection, London.