Brooches Jewels : Art Deco Amethyst Cameo Brooch depicting a lady in profile, framed by onyx and o… 2 September 2018 3540 Brooches Jewels : Art Deco Amethyst Cameo Brooch depicting a lady in profile, framed by onyx and old single-cut diamonds, platinum, and 14kt gold mount, 1 1/4″.